Looking for Novels like Way of the Devil...Like how he gets bigger and uglier as he gets stronger....How he uses brute strength to fight more than techniques..Yu know hulk smash...also the world traveling thing.....
https://www.novelupdates.com/series/mystical-journey/ Same author and very similar to Way of the Devil, it's basically the same thing but a bit worse.
Nightmare’s Call Its good and smiliar and quite unique that the mc tooks the role of Spoiler: Extremists Faction leader The leader of hypocritical church (blend between dark and holy power, human supremacy, extremists) like the antagonist church in other novel
I've finished Nightmare's Call through MTL and the way his "church" progresses is amazing. So although its not like Way of the Devil, the mc does become quite the monster.