To tame it, first use a giga trap with at least 4 metal gates and a giant bear trap, then give it some carcasses, (From what I’ve seen it seem Rhinos are good) wait until it’s friendship bar is full, after this you will be prompted to ride it, you will have several minutes to go around killing creatures. When it’s taming bar reaches 100% it will be tamed. NOTE: do not fight anything powerful with it while taming as damage reduces taming effectiveness, Sanguine Elixir is useful in this taming process.