You utter the forbidden phrase the reveals the ultimate destiny of all things. A spectral timepiece materializes behind you, it's hands counting down the time of all creatures. You can mark any creature in radius, all marked creatures have a copy of the clock engraved on their skin. If a creature leaves the spell radius both the engraving and spell effect remains, no mater how far away they are.   At the end of your turn a charge is given to Memento Mori, every charge causes the spectral timepiece to count down from 12. When the spell ends each marked creature erupts with a surge of necrotic energy and take 12+1d12 per charge of Memento Mori and suffers one of the following Effects  

• 3-5 Charges: Marked Creatures gain disadvantage on Death Saving Throws Permanently and all healing is halved for the rest of combat.

• 6-8 Charges: Marked Creatures gain a vulnerability to necrotic damage and loses all resistances and immunities to necrotic damage they might have had Permanently.

• 9-11 Charges: Marked Creatures gain 3 levels of exhaustion.

• 12 Charges: Marked Creatures are reduced to 0 hit points and instantly die. Their bodies withered and are turned into lifeless dusty corpses.

  You can recast this spell which gives this spell an additional charge per turn. Any other creature in range that knows this spell can cast it as well and that will add an additional charge per turn. Concentration can be broken on any caster of this instantons of the spell and they will no longer contribute charges but as long as one caster has concentration on the spell it remains till the spell ends   Any and all Permanent effects from this spell are Lv9 Curses