Clerical Work: Specialty Priests of Bhaal for D&D 5th Edition

I'm importing the idea of Specialty Priests and channeling a bit of DnD 4E by treating them as Feats.

Specialty Priests of Bhaal

Deathstalker Feat
Prerequisite: Cleric with Death Divine Domain

• Before you make a melee attack with a dagger that you are proficient with, you can choose to take a - 5 penalty to the attack roll. If the attack hits, you add +10 to the attack’s damage.

• You gain proficiency in Survival, Disguise kits, or Poisoner's kits.