I Am The Only Witch Hunter

Story rotates around killing witches and monsters, training and gaining power, gaining mutation (Night Vision, Echolocation, Wall Climb, etc.), gathering herbs and creating concoctions. --- Hunt. Graft. Mutate. That was the core idea of a witch hunter. By grafting organs, the witch hunter gained mutations and ascended his own body, adding more and more power to his flesh. Sir Siderius Satterblade, a Master Witch Hunter in old age, used a Forbidden Alchemical Seal to transfer his soul to another man in another world. This world was Eldoria, a society ruled by witches and benefitted only to witches. Snow, a circus boy, fell prey to a witch's hands. He was to be executed for a crime he did not do. In the moment of desperation, Snow traded his soul and body for Siderius. The new Siderius 'Snow' Satterblade was born. He summoned the S.Y.S.T.E.M., Siderius' most dangerous weapon and escaped the prison, grafting his first mutation and plotting his revenge on those who had wronged him. We follow Siderius on the lonely road of a witch hunter as he gained more mutations, more weapons, more Alchemical Sigils to enact his revenge and become an immortal. --- The MC will NOT become monstrous. The MC stays relatively human with unique appearance traits (black irises, pointy ears, white hair,...) Witches in this novel are irredeemable. Not sexy witches but disgusting and evil witches. (Well maybe a little bit hot because of their magic) MC will not accept nor 'conquer' any witches. Just straight killing. NO ROMANCE. NO HAREM. This man is nothing but a pure killing machine and survivalist. MC is ruthless but not heartless, still save people he deemed useful. NO FACE-SLAPPING NOR SHOWING OFF. MC only cares about power and survival. NO HIDING AS THE WEAK. NO ATTACHMENTS.