Sign up for Everything

Bai Ruofan discovered that he could sign a contract with a living being and gain its abilities. Water respiration of fish, flight of birds, photosynthesis of plants. The invisibility of the octopus, the electric current of the electric eel, the immortality of the tardigrade, the immortality of the lighthouse jellyfish... All the abilities in myths and legends seem to be traceable in reality. Ps. If you don't like the urban immortality style, don't enter!