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Guide:Old One's Army strategies

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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]

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.

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 latter 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.

Tier 1[edit | edit source]

Dark MageT1
Dark Mage.png
Statistics
Type
Environment
AI TypeDark Mage AI
Damage40 / 80
Max Life800 / 1600
Defense18
KB Resist100%
Immune toConfused
Map Icon Dark Mage.png
Map Icon

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, but note that killing one of them does not instantly end the wave.

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]

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]

  • Hallowed MaskHallowed HelmetHallowed HeadgearHallowed armor is a strong choice.
  • Chlorophyte MaskChlorophyte HelmetChlorophyte HeadgearChlorophyte armor is very good for all classes except Summoner.
  • Titanium Mask Titanium Helmet Titanium HeadgearTitanium armor, is a great choice due to its moderately high stats and the Shadow DodgeShadow Dodge buff.
  • Orichalcum Mask Orichalcum Helmet Orichalcum HeadgearOrichalcum armor is especially useful as its set bonus can hit many enemies at once.
  • Palladium MaskPalladium HelmetPalladium HeadgearPalladium armor may be useful due to its Rapid HealingRapid Healing set bonus.
  • Spider MaskSpider armor is the best choice for summoners pre-Plantera, and the Tiki MaskTiki armor is the best post-Plantera. Both will boost the strength of all of your sentries, making them especially strong choices.
  • Forbidden MaskForbidden armor should only be used if the player wants to mix summon and magic weapons, as it doesn't provide enough stat bonuses for either individual class to be useful.

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
For Ranged users
For Magic users
For Summoners

Accessories[edit | edit source]

Tier 3[edit | edit source]

Betsy
Betsy.png
Statistics
Type
Environment
AI TypeBetsy AI
Damage80 / 104 (melee)
65 (fireball)
120 (flame breath)
Max Life50000 / 75000
Defense38
KB Resist100%
Immune toConfused
Inflicts debuff
DebuffOn Fire!On Fire!
Debuff tooltipSlowly losing life
Chance(Breath attack) 100%
Duration7–10 seconds / 14–20 seconds
Drops
Map Icon Betsy.png
Map Icon
}

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.
  • Summoners should summon their minions and sentries while wearing Spooky HelmetSpooky armor, and then swap to Tiki MaskTiki armor for an extra minion.
  • 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.
  • 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 or Menacing or Warding.