Oasisaur [PvP Cross]

A massive flying island covered in a lush oasis on its back, big enough to build a small base on. Its most valuable feature is its pool: it cures diseases and gives Survivors a stacking buff while bathing in it, and most importantly, it can bring your fallen tames back to life. Adult breedable creatures drop a Death Essence when they die, and placing that essence in the Oasisaur's inventory lets you reincarnate them as a baby, once per creature, once every 24 hours per Oasisaur.
Structures placed on its back also get infinite water, unlimited fertilizer for crop plots, a 300% Greenhouse bonus, and bee hives don't need a Rare Flower to produce honey. Note: only 1 Oasisaur is allowed per tribe, and it cannot be stored in a Cryopod.