Aether Wolf

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

Pack Tactics. The wolf has advantage on attack rolls against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally isn't incapacitated.

Spellcasting. The Aether Wolf is a 1st-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 14, +4 to hit with spell attacks). The Aether Wolf has following spells prepared:
Cantrips (at will): Dancing Lights, Light, Thaumaturgy 
1st level (2 slots): Expeditious Retreat, Faerie Fire 

Enlarge/Reduce (3 - 6). The Aether Wolf starts at the size of medium and can enlarge itself to size of large or reduce to the size of small. 

Blink (4 - 6). The Aether Wolf magically blinks, along with any equipment it is wearing or carrying and may also bring one willing creatures with it up to 60ft to an unoccupied space. When the wolf blinks, any creatures within 5ft takes 4 (1d4 + 3) Thunder damage.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 8 (2d6 + 4) Piercing damage. 

Void Touched (5 - 6). When targeted by a melee or spell attack, the Aether Wolf may become intangible until the end its next turn. When intangible, it can not cast spells or attack and can only dash, dodge or disengage.