To tame a crystal wyvren.

1) get crystal in last slot of bottom inventory find wyvren, wait for it to land and try about a hundred times to get up it's wing then sit. Crouched on it's back and feed it+make sure you have food for you.

2) get crytsal and get a Brynox ride to wyvren and hop of Brynox real close to wing and your on! helps So much!

3) Use another wyvren (tamed) and park it next to wild one, hop onto wilds back.

The end lol