He's just a big health bar, once you realise that he becomes nothing more than a mild nuisance due to how much time you have to spend hitting him. Use the pillars provided as a way to dodge the ranged attack, if melee, dodge roll or just walk away from his stomp, and for the roots, just move away from them or kill any that might be annoying.

Also make sure to turn off screen shake, that by far is the deadliest attack he has.