Gelon’s Demi-Lich Ritual

A dark spell, considered forbidden knowledge by many mages guilds and magic colleges. When you cast this spell, you feel the powers of necromancy drain the life force from your very body, as your skin turns grey, cold, and clammy. Your hit points drop to 0, and your maximum hit points are reduced to 0, but you do not die as a result of dropping to 0 hit points. You become immune to necrotic damage and to exhaustion, and no longer need to sleep. If you would normally regain hit points, you instead gain a number of spell slots based on the amount of healing. Gaining a spell slot requires restoring a number of hit points equal to 10 * the level of the spell slot. Any amount of damage that would be dealt to you instead removes a spell slot or several spell slots of total level equal to the damage done divided by 10, rounded down. You no longer regain spell slots after a short or long rest. Instead, every 24 hours you lose one spell slot of every level of spell slot available to you. If you ever lose all of your spell slots, you immediately die, and your body crumbles to dust. When you die in this way, you may only be resurrected by a wish spell or similarly powerful magic.  

8th Level	Necromancy
Casting Time	1 Action (Ritual)
Range	Self
Components	Vocal	Somatic	Material (an onyx worth at least 1000 GP, consumed in the casting)
Duration	Instantaneous
Classes	Cleric	Sorcerer	Wizard

  Gelon’s Demi-Lich Ritual