You can breed two creatures together to create an egg. The new creature that hatches from the egg will have a higher Heredity than its parents, which increases the maximum level it can reach.


Below is a link to a view only Google sheet with results of all current breeding combinations.

https://docs.google.com/spreadsheets/d/1IRmXn4--9fGs_jnxztXE22jx48jRqF9NlWRCFiKTQa4/edit?usp=sharing

(Credit to gay monster dad for the amazing spreadsheet)

(Data pulled from creature pages. Very incomplete.)