[Works on Mobile] The Celestials are all asleep! Click on a Celestial statue to see what monsters it needs. In order to fill the inventory, you need to breed monsters on outer islands then zap it to the statue. Be careful though, there is a time limit. Fill up the inventory as quick as you can to wake up the Celestial! Click the map icon to breed monsters on outer islands. Just choose an island then choose a monster from that island to breed. Once that monster is done, you can either sell it (get rid of it) or zap it to a Celestial! Click the hint icon (the '?' icon in the top right) to toggle hint mode! With hint mode on, you can hover over the monsters' icons during outer breeding to see their names! You can wake up multiple Celestials at a time. It is recommended that you do this! If the time runs out on a Celestial, it's inventory will be filled again and you will have to start over. You cannot breed multiple monsters on an outer island at a time.
