Pyrogenesis

You can transform your body into pure energy. You become immune to normal weapons and physical damage. You can move through cracks and narrow spaces without difficulty. Anyone hitting you takes D6 fire damage per hit as your body flares against their assault. You are immune to Fire damage and take half damage from other energy types. Magical weapons can injure you, but do half damage. Any physical strikes you make do an additional D6 fire damage. You can choose to set adjacent things on fire or not by sheer will.