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== Bugs, Quirks, and Exceptions ==
* '''Additive Amps''' do not apply to many flat values, such as flat weapon damage bonuses, base damage for Melee abilities (Such as the bonus +60 damage from {{HeroIcon|Calico}}'s {{AbilityIcon|Leaping Slash}} T3 upgrade), {{ItemIcon|Capacitor}} active, {{AbilityIcon|Backstabber}}, etc.
* {{ItemIcon|Headhunter}}: Multiplicative non-instance amps are the only amps that work correctly with Headhunter damage.
* {{ItemIcon|Return Fire}}: Because Multiplicative Amps act as defensive stats on the target, if an attacker fires at a target with Return Fire while the attacker has an M-amp active against them, the attacker will take increased reflected damage.
* {{HeroIcon|Billy}}'s {{AbilityIcon|Blasted}} bullet amp is unique as it is a post-mitigation [[True Damage|pure damage]] amp. Because of this, it does not work at all against barriers.
* {{ItemIcon|Silencer}} and {{HeroIcon|Infernus}}'s {{AbilityIcon|Afterburn}} Tier 2 Spirit Damage Reduction are exceptions to the standard Damage Reduction rule. They stack additively with themselves, but multiplicatively with other additive amps.
* {{HeroIcon|Celeste}}'s Spirit damage amp from {{AbilityIcon|Radiant Daggers}} works like a multiplicative amp but is affected by additive amp bugs (see the Additive Amps entry above).
* {{ItemIcon|Unstoppable}}: Suppresses all sources of Damage Reduction while active, but only for [[Spirit Damage]].
* Abilities that scale with Bonus Weapon Damage such as {{AbilityIcon|Gutshot}}, are not impacted at all by Additive Amps or Reductions.
* [[True Damage|Pure damage]] from abilities such as {{AbilityIcon|Ira Domini}} is affected by Additive Amps and Reductions, but not multiplicative ones.