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Aggro is an invisible statistic that determines the distance at which NPCs will begin to attack the player. Aggro is short for "aggression," and is a common mechanic in video games. Terraria features various items that can alter this statistic when equipped.

All enemies target the player based on criteria set in their AI. Most will constantly try for a target, while others may only target if the player is in water, etc.

Currently, the Stardust Guardian is the only summon able to divert an NPC's target away from the player. It overrides the player's presence, but only if it is closer than 200 pixels from said NPC. Otherwise, an NPC may target the player or the Guardian — whichever is closer. It is best to summon the Stardust Guardian closer to hordes of enemies, rather than a small few, to avoid being targeted when a few enemies disperse or die.

Armor and other items that "increases/decreases enemy targeting" make enemies "think" a player is closer or farther away than they actually are. So if you have a Stardust Guardian close to an NPC, but have accessories that increase your aggro, then you could be considered "closer" than the Stardust Guardian is, and you may temporarily be targeted instead of the Guardian.

If the Eternia Crystal is present, the Old One's Army will target it by default, only targeting the player or Guardian if they get "in the way".

Gear[edit | edit source]

Decrease[edit | edit source]

These items reduce the player's "aggro" statistic, meaning that NPCs will have to get closer to target the player.

Item Aggro change
Invisibility PotionInvisibility Potion -750 (while not using an item.)
-250 (while using an item.)
Apprentice's ScarfApprentice's ScarfDesktop Version -400
Huntress's BucklerHuntress's BucklerDesktop Version -400
Monk's BeltMonk's BeltDesktop Version -400
Squire's ShieldSquire's ShieldDesktop Version -400
Putrid ScentPutrid ScentDesktop VersionConsole Version -400
Psycho KnifePsycho KnifeDesktop VersionConsole Version In stealth mode, aggro is decreased based on visibility to a cap of -750
Shroomite armorShroomite armor(full set) In stealth mode, aggro is decreased based on visibility to a cap of -750
Vortex armorVortex armorDesktop VersionConsole Version(full set) In stealth mode, aggro is decreased based on visibility to a cap of -1200
  • Aggro reductions of -750 (or more) nearly guarantee the player will not be targeted.
  • Vortex armor provides the largest aggro reduction available in the game.

Increase[edit | edit source]

These items increase the player's aggro statistic, meaning that NPCs can be farther from the player and still target them.

Item Aggro change
Turtle armorTurtle armor(full set) +250
Beetle HelmetBeetle Helmet +250
Beetle LeggingsBeetle Leggings +400
Solar Flare HelmetSolar Flare HelmetDesktop VersionConsole Version +300
Solar Flare BreastplateSolar Flare BreastplateDesktop VersionConsole Version +300
Solar Flare LeggingsSolar Flare LeggingsDesktop VersionConsole Version +300
Flesh KnucklesFlesh KnucklesDesktop VersionConsole Version +400

Formula[edit | edit source]

Most NPCs will only attack the target they are closest to. They will determine the player's distance first, then the Stardust Guardian's (if applicable) and finally the distance to the Eternia CrystalDesktop Version (if applicable). The distance for the player formula is

abs(target player.x + 10 - npc.x + (npc.width / 2)) + abs(target player.y + 21 - npc.y + (npc.height / 2)) - target player.aggro

The result from that formula is then compared to the guardians formula result:

abs(guardian.x + 25 - npc.x + (npc.width / 2)) + abs(guardian.y + 40 - npc.y + (npc.height / 2)) - 200

Whichever results in the higher value is targeted.

Old One's Army formula[edit | edit source]

Enemies in the Old One's Army follow a separate formula due to having to attack the player, as well as the crystal. An NPC will first determine the distance between the Eternia Crystal and it with a simple distance formula. Then, barring the chance the enemy is currently "ghosted", the NPC determines the "distance" to the player with the following formula.

distance(npc.position, target player.position) - target player.aggro

Even though this formula does account for aggro, a player will be ignored if they are not within 200 pixels of the specified enemy.[1] Like with regular NPCs, if the Guardian is closer to an NPC than the player is, and is within 400 pixels of it, then the Guardian is targeted instead of the player.

Notes[edit | edit source]

  • Desktop VersionConsole Version All Slimes (except Spiked Slimes and King Slime) will ignore the player and the Stardust Guardian entirely when the Royal Gel accessory is equipped.
  • A Confused enemy will always face away from its target.
  • The following is a list of combos for the lowest attainable aggro:
  • The following is a list of combos for the highest attainable aggro:
    • Desktop VersionConsole Version The highest attainable aggro is 1300, resulting from a combo of Solar Flare armor and the Flesh Knuckles.
    • Old-gen console versionMobile Version3DS version The highest attainable aggro is 650, resulting from the helmet and legging pieces of the Beetle armor.

Footnotes[edit | edit source]

  1. Betsy, with a slightly different targeting system, will not target the player based on distance, and will instead target the player so long as the player is closest to it in comparison to the Stardust Guardian or Eternia Crystal.

History[edit | edit source]

  • Desktop
    • Slimes no longer target the player if the player has Royal Gel equipped.
    • Introduced the Stardust Guardian, which can divert aggro away from the player.