Chaos Flame

Through demonic blood magic, the caster siphons a portion of their lifeblood as a Material source for the spell.  The blood is metaphysically gathered in the hand, at which point it ignites into an obsidian fireball.  The caster loses 5 Hit Points in the process.  The Caster chooses a target within 400ft.  The target must make a Dexterity Save of 20.  On a failed save, the target takes 1d6 Fire and 1d6 Necrotic damage, which increases the number of dice at higher levels.  The target takes half damage on successful saves.  This spell ignores resistance.