13th Level Spell

The caster uses the glitter to create a spell casting circle on the ground, the caster then starts chanting ancient incantations unknown to any modern being. The caster is allowed to occasionally take 3 minute breaks from the incantations however they must maintain concentration for the entirety of the 666 hours. The caster must sacrifice 1 magical being every hour. For the duration of the casting the spellcaster gains an armor class of 30 and immunity to magical damage and critical hits; anyone who attempts a physical attack on the caster takes 10d6 necrotic damage. the casting circle can’t be damaged. The spell can be stopped by use of a level 9 counter spell or a wish spell within 10 feet of the caster.

As the spell progresses reality begins to break down. Any effects remain in effect unless replaced.

The spell caster is exempt from these effects.

Upon completion of the spell the DM loses control of everything.  the universe is completely and instantly annihilated, erasing everything across all planes from existence. A new universe is created in its place, the only person in this new universe with memory of the previous one is a reincarnation of the caster of the spell. The new universe must be ran by a different DM. This spell cannot be undone, as such the old campaign setting can't be brought back.