(Found on Reddit)

Quick Guide to tame Ossidon

tranq it to half of max torpor.

approach it and ride it.

it will start making a mucus ball and launching ice spear into the ground.

walk over the spears with the ball and u gain taming effectiveness and progress.

u have a timer, after it end it will kick u off and u need to start from scratch again

tips don't do it downhill and avoid it getting stuck