Pseudodemon — Flesh Shardblack

You are not Evil the way a true fiend is Evil, but your body may as well be. You are immune to spell effects that do not affect Evil creatures, such as Unholy Word or Unholy Blight. Attacks you make count as Evil for the purposes of bypassing DR. Spells with the [Evil] descriptor that deal damage deal extra damage equal to your level; spells with the [Evil] descriptor that do not deal damage last 2 rounds longer.

Abilities that can be used at least 3/day with the [Evil] descriptor can be used 1/day more. While you do not detect as Evil, spells that deal extra damage to Evil creatures will do extra damage to you (since your body is the thing being affected).