Feral Slime-Folk

Subject to their basest instincts, Feral Slime Folk forego the desire to socialize in favor of experiencing new, interesting things to ingest. Lurking in caves and forests far from civilization, these slime folk will hunt for any meal of interest, whether it be small animals, monsters, or even humanoids.

As they are able to quickly digest and absorb food, they are rarely starving: they just focus on the experience and taste.
Digestion. At the beginning of your turn you can deal 1d6 acid damage to a creature engulfed by you.
Consume. When taking a short rest, you can eat one creature that is not more than one size smaller or larger than you that is not a construct, elemental, or undead. When you do, you gain one additional hit dice that you have to spend during that short rest. If the devoured creature is one size larger than you, you roll twice on the gained hit dice and choose the higher result. Consuming a creature will nourish you for one day. You can use this trait a number of times equal to half of your proficiency modifier (rounded down) before you have to finish a long rest to use it again.