- For infected behavior based on their aggression, see Aggression.

Aggro (or aggro bonus) is a player parameter governing how quickly (and at what range, and possibly also - to what extent) infected will become aggravated by the mere presence of a particular player (when aggravation triggers, a symbol of two pink spheres appears beside the infected, as figurative eyes or centers in the brain). The importance of this is threefold:
- Infected aggravated by a player will yield loot to them if killed, even if not damaged by the player in question.
- When a player is attacking a member of an group of infected (regardless of which squads they come from), having more infected aggravated will enhance the chance of that member mutating (mutants are more powerful, but yield much more valuable loot).
- Sufficiently aggravated infected will follow and try attacking the player, sometimes breaking into a dash if able, which may help if they're to be led or just made to come up instead of being chased around (or staying out of range when behind a wall).
There are alternative ways to realize these effects: one and two by damaging multiple targets (elemental and area-of-effect weaponry and kits); one, by granting some effects (like Encouragements or healing) to the players doing the killing (or aggravating). It is unknown but suspected that aggravation of infected actually damaged is redundant (but there could be some unobvious loot value effect for instance). The third effect can be augmented by enabling more strategies from the Strategy table or building up the Threat level.
Aggro bonus won't make the infected spare other players, so it's not useful for winkelrieding.
Increasing Aggro (bonus):
Upgrade kit:
Passive | Aggro bonus +10/20/30/40/50%
Weapon modifier:
Passive | Aggro bonus +50/100/150/200/250%
Skill:
Tough [Passive] Max health +100
[Passive] Aggro bonus +100% Can be bought in Lakewiew from Mei Lee for 100
Protector [Passive] Aggro bonus +100%
[Passive] Physical resistance +20%
Clothing set:
Minesweeper
Minesweeper helmet | PPB |
| ||
Minesweeper Vest | PPP | |||
Minesweeper trousers | PPS | |||
Minesweeper's Boots | PBS |
Weapons:
Alarm clock | 8/10/12/14/16 | M/F/F/F/F | [Combo] Aggro bonus +500%, for 8s |
Baton | ?/24/28/33/38 | Medium | ?/M/?/?/F | [Parry] Critical chance +?/30/36/?/48%, for 1s
[Passive] Aggro bonus +100% [Parry] Counter-attack |
Bone | 15/19/22/26/30 | Fast | [Combo] Aggro bonus +100%, for 5s |
Camera | 19/24/28/33/38 | Very slow | [Combo] Aggro bonus +1000%, for 3s |
Earth globe | 16/21/25/29/42 | Medium | M/M/?/?/F | [Combo] Aggro bonus +200%, for 7s |
Doll | 3/4/4/5/6 | Fast | [Combo] Physical resistance +40/50/60/70/80%, for 8s
[Passive] Aggro bonus +100% |
Electric guitar | 19/24/28/33/38 | Medium | [Attack 50%] Electric damage +57/72/86/100/115
[Combo] Aggro bonus +800%, for 10s |
Flute | 15/19/22/26/30 | Fast | M/F/F/F/F | [Passive] Aggro bonus +100%
[Combo] Blind +50%, for 5s, on an 4m area |
Maracas | 11/14/16/19/22 | Medium | M/M/F/F/F | [Combo] Aggro bonus +100%, for 2s |
Food:
Beef rib | 47/78/94/100/100 | Aggro bonus +5%
Resilience +5% |
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