You speak aloud, demanding a boon from one of the darkest planes. You instantly replicate the effects of any spell of 1st level with a casting time of 1 action or bonus action that deals damage, or any cantrip from any spell list. Each time you cast this spell, roll a d20. If the result is 1, you are struck by an unholy force, reducing you to 0 hit points and causing you to fail your first and second death saving throws immediately after the spell is cast. If you are struck down a second time due to this spell before you finish a long rest, you die and cannot be resurrected by a spell cast using a spell slot lower than 8th level.