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Water/Grass Sea Slug
Based on Elysia chlorotica and Spirobranchus giganteus
First stage lives in water near foliage, found in colonies, camouflages as fallen leaves.
Second stage generally found in colonies, look like underwater forests. The "tree" that grows on it's back is dependent on the leaf that the first stage had taken the appearance of. Can't decide if it should get big with decent sized trees, or stay smallish.