Warlock

Dark One's Blessing: When the warlock reduces a creature to zero hitpoints it gains 8 temporary hitpoints

Spellcasting. The Warlock is a 5th-level spellcaster. It has innate spellcasting and needs no materials to cast its spells

At-Will: Mage Armor
Cantrips (at will): eldritch blast (2 bolts that deal 1d10+3 force damage), mage hand, minor illusion 
1st-3rd level (2 3rd level slots): blindness/deafness, burning hands, command, hold person, fireball, scorching ray

Multiattack: The Warlock makes two attacks with its daggers the second attack has disadvantage.

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

Light crossbow Ranged Weapon Attack: +5 to hit, range 80/320 ft., one target. Hit: 6 (1d8 + 2) piercing damage.