Many people overcomplicate how to tame these— it’s a lot simpler than you think!

A good Daeodon mount with points in Health (and a lot of meat) can tank most Rexes while you keep tranq-ing away on piggyback. They’re decently fast too, so they can keep up when the Rex starts running. Just watch out for Purlovia or Microraptor, or else you’ll become the Rex bait!