Acid

Sprays a creature with acid, possibly reducing their defense. Target creature within range must make a CON saving throw or take 5d6 acid damage and receive one stack of 'Defense Down'. 'Def Down' causes the creature to receive +1 damage from weapon attacks for each stack it has, stacking up to 6 times. All stacks are removed upon exiting combat. When a creature with 'Def Down' would receive stacks of 'Def Up', it will instead lose stacks of 'Def Down equal to the number of 'Def Up' stacks they would receive.