Am I correct in guessing from the cover art that there may be some Bloodborne inspiration here? (I am always on the lookout for soulslike games to add to my Itch collection....)
That fellow with the monster hand is a magi (one of the species of player characters). They can cast more magic rituals per day than other characters at the cost of such physical mutation (such mutations don't have a mechanical effect, but can impact the narrative and interactions with other people).