Ashes to Ashes

You ignite yourself in a blazing infernal fire, dealing 50 fire damage to yourself. The target takes 10d10 fire damage upon a successful hit. This spell ignores resistance and treats immunity as resistance. The target will take an additional 3d10 fire damage for each turn the caster is holding onto the target, while the caster takes nothing. Any person that attempts to remove the caster from the target takes 3d10 fire damage and must succeed a strength contest of the dungeon masters choice.