Crystal 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 an attack roll 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.

Rune Weakness. The wolf relies on its rune to survive. Any damage direct to the rune or close(Head) will do +2 damage.

Reflective Body.  In light their bodies relfect light equal to the light around them. In normal light this is not a problem, but in higher amounts of light anyone within 5ft of the wolf must take a Dex 10 saving throw on any action to keep from being temporarily blinded and rolling with disadvantage.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Glass shatter. Area of Effect:  The creature will take its turn to explosivly shatter. Every creature within 5ft of the wolf will need to make a Dex 12 saving throw or take 3d6 of piercing damage.