The only twos mod I personally know that change the Knight's skin are Lightbringer which makes the Knight's cloak white, and CustomKnight which lets you use any skin for the Knight as soon as you have a spritesheet for it. See the Hollow Knight wiki for spell damage values also includes charm interaction. Hollow Knight - Forge your own path in Hollow Knight! An epic action adventure through a vast ruined kingdom of insects and heroes. Hidden Dreams is the first of the four free content packs for Hollow Knight.