How to tame the ossidon:

1: craft around 150 tranq darts

2: find your ossidon

3: shoot the ossidon with the tranq darts until it becomes dizzy(blue stars will go around its head and it will stop attacking)

4: immediately ride/mount it

5: it will start creating a snowball of mucus, when it does this it will start spitting out icicles run over the icicles in order to gain taming percentage; you have 2 minutes each ride

6: repeat the process until it’s 100 percent!

Tips : if you run into the smallest wall it will forcefully launch you off

I recommend using a pyromane to tank the damage as it hits you

Avoid its icicles and ball running away from it no matter what, even if you are on a tame stay far away