You have strengthened the acids in your body.

You are able to eat wood and chitin, thou it takes about an hour to digest, this is thanks to the strong acids in your body.

You have advantage on saving throws against poison, and you have resistance to poison damage.

Whenever you cast a spell that deals acid damage, your internal acids cover your slime until the end of your next turn. The acid don't harm you or your possessions. While the acid is present, any creature within 5 feet of you that hits you with a melee attack takes 1d4 acid damage.