Black Howler (5e Creature)
From D&D Wiki
Large beast, unaligned
Alert. The howler naturally gains +5 to initiative rolls, cannot be surprised as long as it's conscious, and other creatures don't gain advantage on attack rolls against it as a result of being hidden from it.
Brute. A melee weapon deals one extra die of its damage when the howler hits with it (included in the attack).
Charge. If the howler moves at least 20 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 9 (2d8) bludgeoning damage.
Pounce. If the howler moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the howler can make one bite attack against it as a bonus action.
Reckless. At the start of its turn, the howler can gain advantage on all melee weapon attack rolls it makes during that turn, but attack rolls against it have advantage until the start of its next turn.
Surprise Attack. If the howler surprises a creature and hits it with an attack during the first round of combat, the target takes an extra (2d8) damage from the attack.
Multiattack. The howler makes two attacks: one with its bite and one with its claws. It may substitute its claws with its gore but can't use its gore and its bite against the same target.
Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) piercing damage.
Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) slashing damage.
Sudden Howl (3/Day). The howler utters a sudden, unexpected howl. Each creature within 60 feet of the howler and is aware of it must succeed a DC 15 Wisdom saving throw or become frightened for 1 minute. If the creature is unaware, it is surprised and has disadvantage on the saving throw.
Black howler; the very name sends a shiver up your spine and all throughout your bones. And the visual is even more terrifying; a black howler is a large carnivorous mammal with a boxy cougar's head, a muscular, stocky body on well muscled limbs, and a spiraling set of horns. The only thing that completes the fear inducing imagery is its eerie, unearthly howl.