A devilsaur not be listening to just anyone now. They be hunters. They be killers. You can't scare a devilsaur. You can't be using a whip and expect the devilsaur to obey your command like a slave.
To tame the devilsaur, you gotta take its soul. Take it! Bind it! Fuse it with your artifacts. This be the old ways. The ways of blood and power. You are not after the beast's respect! You be after its submission. Break it to your will. Bend its mind to your power.
Only the greatest of beastcallers be knowing how to do this.