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Guide:Old One's Army strategies

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     • Most likely outdated since 1.4Desktop Version. Remember not to delete pre-1.4 content; use {{eicons}} and {{eversions}}!
  • Desktop versionConsole version Desktop/Console-Only Content: This information applies only to the Desktop and Console versions of Terraria.

    The Old One's Army event differs from others in that the invading enemies do not attempt to kill the player; instead, they focus on destroying the Eternia Crystal used to summon it.

    The invasion is separated into three Tiers depending on progression. It will start at Tier 1, and after a Mechanical Boss has been defeated Tier 2 can be fought. Then, after taking down Golem for the first time, Tier 3 is available.

    The objective is to protect the Eternia Crystal from the enemies until all waves have been defeated.

    Summoning Conditions[edit | edit source]

    In order to summon the event, the Player must place the Eternia Crystal StandEternia Crystal Stand in a roughly flat terrain: a maximum of three tiles of vertical deviation is allowed, any more and the Stand will not accept the Eternia CrystalEternia Crystal.

    The arena needs to be at least 61 tiles long on each side of the Eternia Crystal Stand, measured from the center of the Stand (a 123-tile clearing in total, with the Stand at the center tile). The enemy portals will spawn further away if given the space however, up to 120 tiles away from the center of the Stand on each side. The area also needs 10 tiles of clear vertical space.

    General strategies[edit | edit source]

    Arena[edit | edit source]

    An example of an Old One's Army arena.

    Before facing the event, making a completely flat arena works very well. If an enemy's path to the Eternia Crystal is blocked, it will phase through obstacles, so trying to stop their progress with blocks won't be very effective. Building the floor with Asphalt BlockAsphalt Blocks will greatly increase movement speed. Using Potions is always a good idea, while it is also good to place CampfireCampfires, Heart LanternHeart Lanterns, Honey BucketHoney and Heart StatueHeart Statues to survive for longer. When fighting Tier 2 and 3, building a ceiling above the Eternia Crystal will protect it from Kobold Gliders, since they explode on contact with blocks.

    Build a raised platform 20 blocks off the ground, halfway between the Eternia Crystal and the expected portal location. Placing Flameburst Towers on these platforms will allow them to target flying enemies more easily, which can reduce swarming of the Crystal in later waves.


    Sentries[edit | edit source]

    Using one of the Tavernkeep's Sentries is also highly recommended, as they will greatly help when dealing with the many enemies the player will encounter. There are four different types with three tiers: Rod, Cane, and Staff, with the last being the strongest.

    • BallistaBallistas have the highest damage, but also the slowest fire speed. They shoot bolts that can pierce through enemies. When wearing Squire's Great HelmSquire armor or Valhalla Knight's HelmValhalla Knight armor, the bolts will pierce more and the player will get the Ballista Panic!Ballista Panic! buff when hit, which will double their fire speed. In addition, the Valhalla Knight armor will increase the attack speed.
    • Lightning AuraLightning Auras are a circle of lightning centered on the base that damages enemies repeatedly as they walk through them. They have the lowest base damage, but their damage is unaffected by enemy Defense. When used while wearing Monk's Bushy Brow Bald CapMonk armor or Shinobi Infiltrator's HelmetShinobi Infiltrator armor, they will deal damage slightly faster and they will receive a set 16% (for Monk) or 25% (for Shinobi Infiltrator) critical strike chance. In addition, the Shinobi Infiltrator set will increase the area of effect.

    After the event is summoned, the player will obtain ten Etherian ManaEtherian Mana, enough to summon one Tavernkeep's Sentry. Two Mysterious Portals will appear on the opposite ends of the arena; this where the enemies will spawn. Enemies will drop Etherian Mana when killed, allowing a player to summon more sentries as the event goes on.

    It is easy to get overwhelmed when fighting the enemies coming from both sides, so the player should constantly move to the left and right of the Crystal in order to prevent the enemies from reaching it. They should also always be on the watch for Etherian Wyverns and Kobold Gliders, as they can quickly get to the Crystal and deal a lot of damage to it. The Tavernkeep's Sentries will deal with the weaker grounded enemies; however, they are not very effective against flying enemies.

    It isn't necessary to get every sentry for each tier. An effective strategy is to use a close-range sentry, like the Lightning Aura or Explosive Trap at the portals and a long-range sentry like the Ballista or Flameburst closer to the center.

    Specific strategies[edit | edit source]

    Actuator drop[edit | edit source]

    Since the crystal stand can be actuated, the entire event crystal can be dropped down, much like the flat terrain the event requires. If the Eternia Crystal (NPC)Eternia Crystal (NPC) stands on sufficient ground for the various grounded enemies in the event to stand on, or on its initial elevation, they will float toward the crystal with a shadow aura and still reach it. However, if the crystal is dropped to a single platform or block, and grounded enemies are dropped beforehand (recommended roughly 40 blocks from the center), they'll only float if they get far enough down from the crystal, in which case they float diagonally toward the crystal. When employing this strategy, you should consider placing a water platform (using BubbleBubbles) and using some iteration of Water Walking BootsWater Walking Boots or a Water Walking PotionWater Walking Potion to provide yourself with a platform underneath the crystal, but also to cancel enemies floating toward the crystal: since water is considered a physical block, they'll stop floating. The by far most effective strategy, to solve the issue of floating, is on the other hand placing a long platform of blocks at least 65 blocks below the crystal entity's platform, with a 5 wide by 10 high chamber in the middle.

    A working actuator drop arena
    A full actuator drop arena. Note that what constitutes the non-actuated part of the center is all platforms, allowing for easy reach of the flying enemies. The crystal is dropped to the granite platform, slightly below the stand.

    If the Eternia Crystal (NPC)Eternia Crystal (NPC) is dropped down onto a single block, the enemies are dropped down 40 blocks away from the center and a platform 65 blocks down is built, with a 5 by 10 chamber, these are the results:

    • No ground based enemies, i. e. no Etherian GoblinEtherian Goblins, Etherian Goblin BomberEtherian Goblin Bombers, Etherian Javelin ThrowerEtherian Javelin Throwers, KoboldKobolds, DrakinDrakins or Wither BeastWither Beasts are able to be in range of or reach the crystal, and effectively deal no damage, with one exception, discussed below.
    • A Lightning AuraLightning Aura can be placed in the 5 by 10 chamber to provide consistent damage against all of the above. The tougher enemies (not Etherian GoblinEtherian Goblins or Etherian Goblin BomberEtherian Goblin Bombers) won't consistently spend time in the chamber (instead they'll skip out) but since they can't damage the crystal this is irrelevant to the progress of the event. Using higher level Lightning AuraLightning Auras provides faster progression, which is useful when you're trying to farm the event for Defender MedalDefender Medals.
      • Note that this is a much better solution than only using summons, since only using summons can actually incite DrakinDrakins to float up toward the crystal. Using summons in conjunction with a Lightning AuraLightning Aura is effective.
      • An alternative is not to use Lightning AuraLightning Auras but instead rely on piercing weapons such as the Magical HarpMagical Harp. This strategy is extremely viable since the NPC limit of 200 is quickly reached when the player isn't actively killing the enemies, which means that the flying enemies attacking the portal will spawn predictably and in lower numbers. The number of enemies spawning from new waves will also be controllable.The main downside to this is that DrakinDrakins can follow you and float toward the crystal if inadequately dealt with when visiting the platform. Standing right below the crystal does temporarily disable their floating when they reach your position, but due to their high damage this can be extremely deadly, especially considering the high health of DrakinDrakins.
    • The Dark MageDark Mage and OgreOgre are unable to damage the Eternia Crystal (NPC)Eternia Crystal (NPC). The 40 blocks in distance from the center are valuable since the Dark Mage will stop roughly that length away from the crystal and try to summon Old One's SkeletonOld One's Skeletons, a spell which will fail since there is no ground for them to be summoned on. The Dark Mage is thereby unable to inflict any damage. Likewise, the 65 blocks down the platform was placed is specifically such that the Ogre's balls of snot won't hit a player defending the crystal slightly from below, or the crystal itself.
    • Effectively, the player can go the all three tiers worrying solely about Etherian WyvernEtherian Wyverns, Kobold GliderKobold Gliders and Etherian Lightning BugEtherian Lightning Bugs, as well as BetsyBetsy. For enemies, placing Flameburst TowerFlameburst Towers is an effective way to provide damage and knockback high enough to keep the flying enemies away from the crystal, even more so with summoner gear. With effective placement and sufficient armor, the event becomes mostly automatic even in Master Mode, apart from BetsyBetsy. It's always a good idea to keep an eye on the Eternia Crystal (NPC)Eternia Crystal (NPC) at all times, on the other hand, especially in earlier waves.

    Tips[edit | edit source]

    Do note that Etherian Lightning BugEtherian Lightning Bugs fly in line with the crystal's height rather than quite far above it like the other flying enemies, so anyone entering Tier 3 should be ready to place Flameburst TowerFlameburst Towers close to and in level with the crystal to ensure aid with the bugs.

    Additionally, make sure to bring a Treasure MagnetTreasure Magnet and a Rod of DiscordRod of Discord to be able to safely teleport under the platform and collect the Etherian ManaEtherian Mana. Also, consider building the platform out of Conveyor BeltConveyor Belts to collect the mana in a more central location.

    Most importantly, to be able to view the Eternia Crystal (NPC)Eternia Crystal (NPC) while killing the OgreOgre, collecting Etherian ManaEtherian Mana, or personally killing the enemies in the box, bring BinocularsBinoculars, a Sniper RifleSniper Rifle or simply use any iteration of the Rifle ScopeRifle Scope to provide an increased range of view and some oversight of the crystal. Ranged builds are recommended for this strategy since they can utilize a scope for accessible good sight and high precision in killing the flying enemies. Use non-homing bullets.

    Consider placing banners for WyvernWyverns, HarpyHarpies and Angry NimbusAngry Nimbuses if the arena is placed relatively high above the surface, since they can spawn during the event and be a significant distraction, as well as deal damage. Especially WyvernWyverns.

    Tier 1[edit | edit source]

    Dark MageT1
    Dark Mage.png
    Map Icon Dark Mage.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    Statistics
    Type
    Environment
    AI TypeDark Mage AI
    Damage40/80/120 (melee)
    80160240 (dark energy) [1]
    Max Life800/1600/2040
    Defense18
    KB Resist100%
    Immune toConfused
    Drops

    Tier 1 is the easiest, as it possesses the weakest enemies and lasts five waves. It can only be summoned after the Eater of Worlds/Brain of Cthulhu have been defeated, as then the Tavernkeep will spawn for the first time.

    The player will see five different enemies:

    • The Etherian GoblinEtherian Goblin is the basic enemy of the event as well as the most common. It doesn't possess high stats or a special attack, making them very easy to kill.
    • The Etherian Goblin BomberEtherian Goblin Bomber and Etherian Javelin ThrowerEtherian Javelin Thrower are stronger enemies with ranged attacks. They will start spawning on Waves 2 and 3 respectively.
    • Etherian WyvernEtherian Wyvern is a highly damaging enemy with the ability to fly. It will quickly fly towards the Crystal, and then it will dive towards it. It will start spawning on Wave 4.
    • The Dark MageDark Mage is the Boss of the tier, spawning on Wave 5. It will alternate between shooting magical energy at the player, summoning Old One's SkeletonOld One's Skeletons and healing all enemies around it. It needs to be killed in order to finish the event.

    Master Mode: Ballistas are not fast enough to kill the grounded mobs, but three Lightning Aura sentries at each entrance can kill them quickly enough. In this mode, Etherian Wyverns can destroy your crystal in just seconds, so placing a couple Ballista sentries on a platform about 20 blocks off the ground can help in killing them.

    Recommended gear[edit | edit source]

    While the event can be summoned at any time after defeating Eater of Worlds/Brain of Cthulhu, it's better to use the best gear available in Pre-Hardmode.

    Armor[edit | edit source]

    • Molten HelmetMolten armor provides the highest defense and good bonuses for Melee characters.
    • Necro HelmetNecro armor will give greater bonuses to Ranged characters.
    • The Wizard set with Wizard HatWizard Hat and Gypsy RobeGypsy Robe or Diamond RobeDiamond Robe provides the best offensive bonuses.
    • A Summoner should not attempt the event without obtaining Bee HeadgearBee Armor first.
    • Console VersionMobile Version A Thrower should get Fossil HelmetFossil armor from the Desert. If you don't want to spend your time getting it, the Ninja HoodNinja armor is a good, but still weaker, alternative.

    Weapons[edit | edit source]

    In addition to their normal weapons, all classes should also use one of the Tavernkeep's Sentries.

    For Melee users
    For Ranged users
    For Magic users
    For Summoners
    Console VersionMobile Version For Throwing users

    Accessories[edit | edit source]

    Tier 2[edit | edit source]

    OgreT2
    Ogre.png
    Map Icon Ogre.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    Statistics
    Type
    Environment
    AI TypeAttacker AI
    Damage70/140/210 (melee)
    122245367 (club swing) [3]
    120160240 (ground pound)
    80120180 (spit) [4]
    Max Life5000/10000/12750
    Defense34
    KB Resist100%
    Immune toConfused
    Inflicts debuff
    DebuffOozedOozedDesktop VersionConsole Version
    Debuff tooltipMovement is significantly reduced
    Chance100% (spit)
    Duration15 seconds [5]
    Drops

    After a Mechanical Boss has been defeated, the second tier can be fought.

    The player will find five new enemies, and the four basic ones from the previous tier will get significantly higher stats, which is reflected on their different designs.

    • KoboldKobolds are one of the new enemies found. When near the player or the Eternia Crystal, it will quickly dash towards them, exploding on contact. The explosion deals high splash damage.
      • In the later waves, the player will also find Kobold GliderKobold Gliders, a variant with much lower stats but the ability to fly like Etherian Wyverns.
    • DrakinDrakins have high health, defense, and knockback immunity, making them very hard to kill. They are very slow, however they will fire magical shots from a distance.
    • Wither BeastWither Beasts will surround themselves with an aura of crystals which will inflict the Withered ArmorWithered Armor debuff, halving defense of players inside of it. They also possess high health, and they can regenerate damage taken.
    • The OgreOgre is the boss of the tier. It possesses very high damage and health, and does three dangerous attacks. From a long range, the Ogre will hurl a ball of snot at a target, it will only damage targets it hits but it will inflict the OozedOozed debuff on any nearby player, slowing them down significantly. It can also jump into the air and land with a shockwave, doing area damage about ten blocks forward in each direction on the ground. At very close range, it will strike with its club, dealing very high damage. Like the Dark Mage, it needs to be the last enemy killed in order to finish the event. When killed also drops an unique Accessory or Weapon.

    Recommended gear[edit | edit source]

    Armor[edit | edit source]

    Weapons[edit | edit source]

    Just like in Tier one, all classes should also use one of the Tavernkeep's Sentries with their normal weapons.

    For Melee users
    • 2 players with at least 3 light disks each and a wall behind both portals can be devastating. Have each player stand in front of a portal rapidly throwing at the portals. Combined with sentries this can destroy enemies. ( there are some issues with this strategy: when the ogre comes move away and fight him differently, also when flying enemies can be hard to hit)
    • The Terra BladeTerra Blade and the SeedlerSeedler are the strongest swords available pre-Golem.
    • With enough attack speed bonuses, the Fetid BaghnakhsFetid Baghnakhs is an extremely powerful weapon.
    • Death SickleDeath Sickle is a very good weapon as well.
    • The YeletsYelets and The Eye of CthulhuThe Eye of Cthulhu are the strongest yoyos available.
    • The Chlorophyte PartisanChlorophyte Partisan and Mushroom SpearMushroom Spear are both very strong Spears.
    • The Shadowflame KnifeShadowflame Knife is good against both crowds and single targets.
    • A Flask of IchorFlask of Ichor or Flask of Cursed FlamesFlask of Cursed Flamesshould always be used if available.
    For Ranged users
    For Magic users
    For Summoners

    Accessories[edit | edit source]

    Tier 3[edit | edit source]

    BetsyHardmode exclusive
    Betsy.png
    Map Icon Betsy.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    Statistics
    Type
    Environment
    AI TypeBetsy AI
    Damage80/104/156 (melee)
    70140210 (fireball)
    70140210 (flame breath) [7]
    Max Life50000/75000/95625
    Defense38
    KB Resist100%
    Immune toConfused
    Inflicts debuff
    DebuffOn Fire!On Fire!
    Debuff tooltipSlowly losing life
    Chance100% (flame breath)
    Duration7–10 seconds14–20 seconds17.5-25 seconds [8]
    Drops

    After the Golem has been defeated, the third and final tier of the Old One's Army can be fought.

    Like the previous tiers, enemies will get significantly higher stats, and some will also get new designs. There are also two new ones:

    • Etherian Lightning BugEtherian Lightning Bugs will quickly fly near the Crystal, and attack it with energy projectiles. They will inflict Withered WeaponWithered Weapon on hit, which will temporarily halve the damage output of all weapons.
    • Betsy, who will spawn on Wave 7 serving as the final boss of the event. Unlike the other enemies, she will directly focus on killing the player instead of the Crystal. Her attacks consist of spinning in circles before charging multiple times, breathing fire, shooting fireballs and spawning Etherian Wyverns. While her attacks don't deal too much damage to the Crystal, the threat of the other enemies can make the final wave significantly harder than the others. Like with the Dark Mage and Ogre on Tiers 1 and 2, killing her will end the event.

    Gearing Up[edit | edit source]

    Armor[edit | edit source]

    • Beetle HelmetBeetle armor is the best choice for a Melee character. The Mail gives significant buffs to offensive stats, while the Shell adds a great amount of damage reduction.
    • Shroomite HelmetShroomite armor is the best for a Ranged user. Its set bonus is particularly useful since the player can beat the event by shooting the enemies while standing in the center.
    • Spectre MaskSpectre armor is the best for a Mage. The Hood should only be used when healing is needed, since it will greatly reduce damage dealt.
    • Console VersionMobile Version Summoners should summon their minions and sentries while wearing Spooky HelmetSpooky armor, and then swap to Tiki MaskTiki armor for an extra minion. Note that this no longer works as of 1.4.0.1Desktop Version, since all summon damage is constantly recalculated.
    • All classes can benefit from the Monk's Bushy Brow Bald Cap.pngSquire's Great Helm.pngHuntress's Wig.pngApprentice's Hat.png tier 1 armors sold by the Tavernkeep. While they are less powerful than the above armors, they boost sentry power significantly, allowing the player to focus on Betsy without worrying about the rest of the Old One's Army. The Shinobi Infiltrator's Helmet.pngValhalla Knight's Helm.pngRed Riding Hood.pngDark Artist's Hat.png upgraded versions of their armor are even more powerful, and can be purchased with Defender Medals earned from beating the Tier 2 Old One's Army or from beating rounds 1-6 of the Tier 3 Army.

    Weapons[edit | edit source]

    For Melee users
    For Ranged users
    For Magic users
    • The Charged Blaster CannonCharged Blaster Cannon is capable of firing from one portal to the other, piercing every enemy along the way, and killing all but bosses instantly


    For Summoners
    • The Xeno StaffXeno Staff is the best minion available. As of update 1.4 on PC, both TerraprismaTerraprisma and Desert Tiger StaffDesert Tiger Staff are very effective, as well.
    • The Staff of the Frost HydraStaff of the Frost Hydra can be used as an extra sentry that doesn't cost Etherian Mana.
    • Dark HarvestDark Harvest makes your minions do additional damage to nearby mobs, letting the player focus on bosses while the dark energy kills smaller enemies.
    Accessories[edit | edit source]

    It's recommended to reforge all accessories to Lucky, Menacing, or Warding.


    References[edit | edit source]

    1. Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI_109_DarkMage() in Terraria.NPC.cs
    2. 2.0 2.1 Information taken from the Desktop version Desktop 1.4.0.5 source code, method RegisterDD2EventDrops() in Terraria.GameContent.ItemDropRules.ItemDropDatabase.cs
    3. Information taken from the Desktop version Desktop 1.4.0.5 source code, method GetMeleeCollisionData() in Terraria.NPC.cs
    4. Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI_107_ImprovedWalkers() in Terraria.NPC.cs
    5. Information taken from the Desktop version Desktop 1.4.0.5 source code, method Kill() in Terraria.Projectile.cs
    6. 6.0 6.1 Information taken from the Desktop version Desktop 1.4.0.5 source code, method RegisterDD2EventDrops() in Terraria.GameContent.ItemDropRules.ItemDropDatabase.cs
    7. Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI_110_Betsy() in Terraria.NPC.cs
    8. Information taken from the Desktop version Desktop 1.4.0.5 source code, method StatusPlayer() in Terraria.Projectile.cs
    9. Information taken from the Desktop version Desktop 1.4.0.5 source code, method RegisterBoss_Betsy() in Terraria.GameContent.ItemDropRules.ItemDropDatabase.cs