Ravenous Devourer

After consuming a various amount of creatures and monsters, you slowly begin to see some of features appear. On your body, you see patches of Wolf Fur, slits of Merfolk Gills, horns of a Demon Crown, and even the Strength from the Undead. And this could have been completely avoided, if you just didn't eat the random meat from the Butcher's trash can.

You become a ravenous monster whose only goal is to eat new or delicious meats, thus granting you the following benefits:

• During combat you have advantage against creatures, whose race you previously eaten.
• When you make a Bite attack, you deal an additional die of damage.
• After eating a creature, if its CR is half your level or lower, rounded down, you gain a random resistance, action, or racial feature. This benefit can't be used again until the next Dawn.

(Dm Note: You get to choose what benefit is given, at random. Best way to decide which, of the three main options, to give the bonus is a D3 or a D6.)