Aggro

Aggro, short for aggression, is an invisible statistic that determines the distance at which enemies will begin to attack the player.

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, for example.

Armor and other items that "increase/decrease enemy targeting" cause enemies to consider a player to be closer or farther away than they actually are. Certain accessories, armor, and other sources in the Calamity Mod affect Aggro.

Source	Aggro change
Rogue stealth	Aggro is decreased based on visibility to a cap of -900
Colossal Squid	-750 (while being eaten)
Psychotic Amulet	In stealth mode, aggro is decreased based on visibility to a cap of -750
Eclipse Mirror	-700 (also reduces Abyss detection)
Abyssal Mirror	-450 (also reduces Abyss detection)
Reaver armor	-200 (Reaver Headgear, also reduces Abyss detection)
Mirage Mirror	-200
Wulfrum armor	+100 (Wulfrum Helm)
Victide armor	+200 (Victide Helm)
Aerospec armor	+300 (Aerospec Helm)
Statigel armor	+400 (Statigel Helm)
Daedalus armor	+500 (Daedalus Helm)
Reaver armor	+600 (Reaver Helm)
Hydrothermic armor	+700 (Hydrothermic Helm)
Tarragon armor	+800 (Tarragon Helm)
Bloodflare armor	+900 (Bloodflare Ram Mask)
God Slayer armor	+1000 (God Slayer Horned Greathelm)
Elysian Aegis	With guard activated, aggro is quickly increased to a cap of +1,100
Asgardian Aegis	With guard activated, aggro is quickly increased to a cap of +1,100
Auric Tesla armor	+1,200 (Auric Tesla Royal Helm)

Notes

• Aggro reductions of -750 (or more) nearly guarantee the player will not be targeted.
• Enemies in the Abyss have their own unique detection radius system, independent of Aggro, which can be affected by items such as Anechoic Coating and Abyssal Diving Suit as well as the Luminous Corvina enemy.
  • Despite this, being eaten by Colossal Squid decreases Aggro rather than the Abyss creatures' unique detection radii.