Belier’s Bite
Your unarmed strikes cause your opponent to bleed.
Prerequisite: Improved Unarmed Strike.
Benefit: When you damage an opponent with an unarmed strike, you deal an extra 1d4 bleed damage.
Special: This ability does not stack with other special abilities, attacks, or items that allow you to deal bleed damage. The belier devil appears in Pathfinder Adventure Path volume #12.
Source: Cheliax, Empire of Devils, p. 26