To tame the ossidon, you will need something that does torpor and a bunch of time. After you get all that, go find your Ossidon. Now you’re gonna shoot it with whatever you have for torpor. Then shoot it till it’s at 50%. Once it’s stunned start riding it. Now it’ll start making a slime ball and it’ll be spitting out icicles. run over with that slime ball and pick up the icicles in the ball to start the taming. You have two minutes to do this before it forces you off. after you’ve been forced off, repeat the tour process and get back on and just repeat that till it’s tamed.

Happy taming