The Elder Scrolls: Tamriel

You utter a cursed word of power that strips your enemy of vitality and resilience. Choose one creature within 60 feet that can hear you. It must make a Constitution saving throw (DC = 8 + your proficiency bonus + your Charisma or Wisdom modifier). On a failed save, the creature is Marked for Death, taking 1d6 necrotic damage at the start of each of its turns. Attack rolls against the target are made with advantage the first time each attacker hits per round, and the target’s AC is reduced by 1 (to a minimum of 10). The creature can repeat the saving throw at the end of each of its turns, ending the effect on a success. At higher levels, damage increases to 2d6 at level 11 and 3d6 at level 17. At level 15+, the AC penalty increases to -2. A creature that succeeds the initial save takes no effect and becomes immune to this shout for 24 hours. This spell does not affect constructs, undead, or creatures immune to necrotic damage.