Two-Headed Troll's Journey to Devour the World

It is said that before they were bewitched by evil, the most perfect race created by the gods was the trolls... I think, therefore I am, even though I am only a head. The world is a fantasy wasteland, the wind of magic is raging, and the protagonist cannot turn into a human. As a summoned chess piece, look for opportunities to become stronger from the wizard world, DOTA battlefield, and WOW continent. The truth behind the fateful journey unfolds step by step, and will the final outcome be cruel and unsolvable?