Homebrew
Keen Hearing and Smell. The worg has advantage on Wisdom (Perception) checks that rely on hearing or smell. Pack Tactics. The worg has advantage on an attack roll against a creature if at least one of the worg’s allies is within 5 feet of the creature and the ally isn’t incapacitated. Void Bite. When the worg hits with its bite attack, the target takes an additional 4 (1d8) necrotic damage, and the worg regains hit points equal to the necrotic damage dealt.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.
Ethereal Step. Once per battle, the worg can use a bonus action to magically shift into the Ethereal Plane, appearing anywhere within 30 feet on its next turn. It can see and hear the Prime Material Plane while on the Ethereal Plane but can't affect it or be affected by it until it returns.
Forest, Grassland, Hill