Warlock of the Undying

Spellcasting. The warlock is a 11th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 14, +6 to hit with spell attacks). It regains its expended spell slots when it finishes a short or long rest. It knows the following warlock spells:

Cantrips (at will): spare the dying, eldritch blast, friends, mage hand, true strike, poison spray, vicious mockery 

1st–5th level (3 5th-level slots): chill touch, blindness/deafness, death ward, ray of sickness, silence, fear, hold monster, aura of life, contagion, false life, witch bolt

Defy Death - on a successful death saving throw or when using spare the dying, add 1d8 plus Constitution bonus hp.  Recharges after long rest.

Dagger. Melee or Ranged Weapon Attack: +3 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.