The rhynio has a similar taming method to the reaper you have to kill a male to get a certain item then eat the item which is called fertile essence then you need to find a female rhynio and get is to under 10% of its health and will do a special attack to give you the baby but it has to be done in the air or underwater so it can use all of its legs as required unfortunately the female will only give a baby to someone that’s a higher or the same level as it although that’s not confirmed to stay in the game.

-TekReaper