When the Isle of Giants was discovered off the coast of Pandaria, teeming with primal devilsaurs, Garrosh sent men to capture some of the most fearsome specimens, hoping to subjugate them and use them as beasts of war. Countless orcish beastmasters have fallen to Thok's jaws as they struggle to trap and cage him, yet the creature's thirst for blood remains unslaked.
Thok is an "all in" melee assassin that alternates between two modes: Leashed and Unleashed. While Leashed, Thok is chained to a Kor'Kron Jailer and follows him passively. During this phase the player controls the Kor'Kron Jailer, who merely has weak basic attacks.
There are two ways for Thok to become Unleashed. The Kor'Kron Jailer's health acts as a shield equal to 25% of Thok's health. While the Kor'Kron Jailer is alive, all damage dealt to Thok is redirected to the Jailer. If the Jailer is killed Thok becomes Unleashed, gaining new abilities. The other way for Thok to become Unleashed is to simply eat the Kor'Kron Jailer.
Above we see Thok while he is Leashed to his Kor'Kron Jailer, providing a shield. Note that Thok is the only one that has a hitbox.
When Thok becomes Unleashed he loses the shield provided by his Kor'Kron Jailer and grows in size. He is now ready to hunt his prey.
The Thok player would not want to simply Unleash Thok immediately as the Kor'Kron Jailer has one ability: Provoke. This increases the damage Thok will deal the next time he is Unleashed, so it is wise to stack this buff to its maximum capacity if possible. The Kor'Kron Jailer will respawn 20 seconds after being killed. The Thok player would have to find a balance between the more passive Leashed play and the "all in" attack play of Unleashed.
P.S. Devour is already used by Stitches, maybe change it to Chomp? And I also think you should think up another name for Devilsaur maybe Primal Rage? (a nod to a classic Dino Fighting game).
And yeah winston already has it. I'll go look around for a good alternative for it.
The chain connecting the Jailer to Thok is actually a screenshot of the giant chains on Sky Temple hahaha