Pseudodemon — Fiendish Body

You have horns or claws and a tail. You gain Prehensile Tail and Maw or Claw (you have both a maw and a claw). You also get Grasping Tail as a bonus feat. You have resistance to Evil damage equal to half your level rounded up.

Beyond being useful in general for various things, your tail is also venomous (when you want it to be). Attacks with your tail deal 1 extra damage, +1 per 2 levels, and those struck must make a fortitude save or be affected by a spiritual poison (the fortitude DC is constitution-based). The poison’s effect depends on the individual pseudodemon but is generally quite powerful.

At 5th level, you gain the ability to teleport 15 feet once per 10 minutes as a swift action.