Chronohound

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

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

Temporal Attunement. The chronohound has advantage on saving throws against Transmutation spell effects.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (3d4 + 4) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.

Warping Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6+4) slashing damage. If the target is a creature, it must succeed on a DC 15 Wisdom saving throw or have it's speed reduced by half. 

Expeditious Howl. (1/Encounter) The chronohound lets out a howl that echos across the local timestream, bending it slightly to it's whim. The chronowolf gains the effect of the Haste spell on itself. This effect can be dispelled, but cannot be counterspelled. 

Disruptive Howl. (1/Encounter) The chronohound lets out a howl at a single creature that disrupts their local flow of time. The creature must succeed on a DC 15 Wisdom saving throw or gain the effect of the Slow spell on itself. This effect can be dispelled, but cannot be counterspelled. As per Slow, the creature may repeat the Wisdom saving throw at the end of each of it's turns, ending the effect on a success.

Timewarp. When the chronohound takes damage, it may take the Disengage action and move up to it's speed as a reaction.