Corrupted Shield Feat 6
Source Pathfinder Advanced Player's Guide
Prerequisites divine ally (shield), tenets of evil
Your shield ally is more than just a spirit of protection-it's a conduit for deadly divine magic.
When you use your shield ally to Shield Block a melee unarmed attack or a melee weapon Strike from an adjacent creature, the attacker takes 1d6 evil damage or negative damage (your choice).
If the attack or Strike breaks or destroys your shield, double this additional damage.
The damage the attacker takes increases to 2d6 damage at 11th level and 3d6 damage at 16th level.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
ChampionThis indicates abilities from the champion class.
DivineThis magic comes from the divine tradition, drawing power from deities or similar sources. Anything with this trait is magical.
NecromancyEffects and magic items with this trait are associated with the necromancy school of magic, typically involving forces of life and death.
NegativeEffects with this trait heal undead creatures with negative energy, deal negative damage to living creatures, or manipulate negative energy.