So, I took appemts at 1-st level gnoll with this concept. Here's the result (please, help me to estimate the balance):
At-wills (what does he do for life?)
Ferocious Strike (reflavored fighter's Reaping Strike)
Mad Bite: non-weapon, Str vs. AC, provokes AoO, 2d6+Str dmg.
I asked myself: why...