Ancient Abyssal Canine

Fey Ancestry. The canine has advantage on saving throws against being charmed, and magic can’t put the canine to sleep.

Innate Spellcasting. The canine's spellcasting ability is Charisma (spell save DC 11). It can innately cast the following spell, requiring no material components:

At will: faerie fire, Cause Fear, Hexl, Spare The Dying, Eldritch Blast, Hellish Rebuke, Darkness

Pack Tactics. The canine has advantage on an attack roll against a creature if at least one of the canine's allies is within 15 feet of the creature.

Evasion. When the canine is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.

Keen Hearing and Smell. The canine has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Bite. Melee Weapon Attack: +3 to hit, reach 10 ft., one target. Hit: 4 (8d8 + 10) piercing damage.

Claws. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 12 (10d10 + 12) piercing damage.

Teleport (Recharge 2–6). The canine magically teleports, along with any equipment it is wearing or carrying, up to 60 feet to an unoccupied space it can see. Before or after teleporting, the canine can make one bite attack

Abyssal Lair. The canine may transport its self and any it chooses within 5 feet of it to or from a lair located in the abyss with no rest needed between use.

Howl of the void. As a reaction once per an opponents turn on a successful hit to the ancient canine, summon two abyssal canines.