Acid
Energy
Part of Caustic
Acid is a CausticCaustic EnergyCaustic is an Energy group that deals natural Damage. EnergyEnergy EnergyEnergy is the typed force an Effect carries, which sets the kind of Damage it deals. that deals DamageDamage HealthDamage is harm that reduces your Hit Points. (Acid). Acid EffectsEffect TargetEffects are Targets produced by actions, whether yours, someone else’s, or the environment’s. create or manipulate corrosive substances.
Core Rule—Acid
Acid EffectsEffect TargetEffects are Targets produced by actions, whether yours, someone else’s, or the environment’s. may also inflict Persistent DamagePersistent Damage ConditionPersistent Damage is a Condition that keeps hurting you over time..
Source Player Codex