Sometimes referred to as Death's Crown, Zirryk'sthalmalis, a legendary ancient black dragon, has used her cruel intelligence to craft a great many spells throughout the centuries. This spell found its way into the hands of mortals by virtue of a particular servant of hers; he was subsequently dissolved in acid, but the damage had been done.

When you cast this spell, a twisted, seven-pointed crown of simmering, seething acid appears above your head, rotating lazily. For the duration, you are completely immune to acid damage, and you can walk across acid as though it were solid ground. Any spell of up to 5th level, including cantrips, that you cast that deal acid damage deal an additional 6d4 acid damage.

As a bonus action you can sacrifice one of the points on the crown, launching it at target within 120 feet. Make a ranged spell attack against the creature; on a hit the creature takes 6d4 acid damage. If you consume all seven spikes on the crown, the spell ends on you immediately.