Warlock of Yeenoghu

Agonizing Blast. The warlock adds its charisma modifier to the damage it deals with Eldritch Blast.

Dark One's Blessing.  Whenever the warlock reduces a hostile creatures HP to 0, it gains 6 temporary hit points.

Devil's Sight. The warlock can see through magical darkness with a range of 120 ft. 

Spellcasting. The warlock of yeenoghu is a 3rd level spellcaster. Its spellcasting ability is charisma (spell save DC 13, +5 to hit with spell attacks). The warlock of yeenoghu has following warlock spells prepared:
Cantrips (at will): eldritch blast, green flame blade
1st level (0 slots): Armor of Agathys, Cause Fear, Hex
2nd level (2 slots): Darkness

Create Pact Weapon. The warlock creates a melee weapon in its hand, it is automatically proficient with the weapon, and the weapon disappears if this action is used again or is more than 5 ft away from the warlock for 1 minute.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 2) piercing damage.

Pact Weapon Attack. Melee Weapon Attack: +4 to hit, reach 5/10 ft., one target. Hit: 7/8/9 (1d8/1d10/1d12 + 2) bludgeoning/piercing/slashing damage.

Eldritch Blast. Ranged Spell Attack: +5 to hit, range 120 ft., one target. Hit: 9 (1d10 + 3) force damage.

Rampage. When the warlock reduces a creature to 0 Hit Points with a melee weapon attack on its turn, it may use a bonus action to move up to half its speed and make one Bite attack.