Easy way to tame-

1.Bring a baby Rex or 2 mammoth

2. Kill them

3.Drag the body using your mount (required a high lvl flyer Rhinonata is best)

4.It will eat and you will gain the trust

5.Now it's time to kill the minions..the more you kill the more your dmg increase

Well note that even a yuti can gain 100% trust .....