Melt Defenses
You can dissolve key portions of your target’s defenses, making them easier to hit.
Preqrequisite
Base attack bonus +11.
Benefit
When you score a critical hit with an attack that deals acid damage, instead of applying the normal critical hit effect, you can disrupt the target’s defenses for 1d4 rounds. Attacks against a creature whose defenses have been disrupted in this manner target EAC, regardless of the attacks’ damage type.
Source
Character Operations Manual pg. 116
Dragonscript
ID
2ea7b78fbc0ba9ab7b912c11
Preqrequisite
condition character.bab.featPrerequisite >= 11;