Dark Howl is a Unique Gloves in Diablo IV Season 15. It drops from Urivar.
Unique power
Debilitating Roar is now a Werewolf Skill. In addition, Debilitating Roar increases your damage by [60-80%][x] while in Werewolf form for the duration.
Affixes
600 Armor
+[0.5-8.5]% Critical Strike Chance (0.5-8.5%)
Where it drops
World drop (any difficulty, drop rate scales with Torment tier)
Dedicated drop: Echo of Urivar (Lair Boss, Torment 1+; Boss Trophy: Judicator's Mask)
Horadric Cube: Item Transmutation (Upgrade to Unique) - Common item of the same slot + 1 Enhanced Primordial Dust + 10 Primordial Dust (random Unique of that slot)
Horadric Cube: Item Transmutation (Amalgamation) - 5x Judicator's Mask (Boss Trophy) rolls a Unique from this boss's pool; can roll Mythic quality with the 'Crafted' tag