Physical Description.

"The towering monstrosity appears as a great scarred gnoll, 14  feet (4.3 m) tall with a grinning skull-like face and a leering pair of burning amber eyes atop its seemingly emaciated form. A mangy, yellow crest of fur reaches from its head to mid-back, with the only hair on its body being small scabby patches. The rest of its body is pale and gray, its leathery hide contrasting with his taut mane and a crest of blackened spines within it. The demonic canine's chest is armored with a patchwork of discarded shields and breastplates held together with weighty chains, and decorated with the flayed skin of the behemoths enemies. In its malformed claws it wields a massive triple-headed flail, screams of discordant laughter seems to eco from the great weapon."

Yeenoghu.

The Beast of Butchery appears as a great scarred gnoll, towering 14 feet tall. Yeenoghu is the Gnoll Lord, and his creations are made in his twisted image. When the demon lord hunted across the Material Plane, packs of hyenas followed in his wake, and those that ate of great Yeenoghu's kills became gnolls. Few others worship the Beast of Butchery, but those who do tend to take on a gnoll-like aspect, hunching over and filing their teeth down to points.

Yeenoghu wants nothing more than slaughter and senseless destruction. Gnolls are his favorite instruments, and he drives his gnoll followers to ever-greater atrocities in his name, even imbuing some of their commanders with his powers, which transforms them into flinds. Yeenoghu takes pleasure in causing fear before death, and he sows sorrow and despair through destroying beloved things. He doesn't parlay; to meet him is to do battle with him—unless he becomes bored and wanders away. The Beast of Butchery has a long rivalry with Baphomet, the Horned King, and the two demon lords and their followers attack one another on sight.

The Gnoll Lord is covered in matted fur and leathery hide, and his face resembles a grinning predator's skull. He wields a triple-headed flail called the Butcher, which he can summon into his hand at will, although he is as likely to tear his prey apart with his teeth.

Personality.

Yeenoghu's desires are savage in nature, wanting slaughter and destruction above all else. He despises civilization and if he were to conquer other realms, abyssal or otherwise, he would not attempt to rebuild their former structures.

To the Beast of Butchery, the gnolls are both his instruments and children, whom he seeks to use to bring his ideal world to fruition. Such a world would be one of endless combat and brutality, where gnolls ruled supreme and all other creatures would be either slaves or food. Ultimately when the mortal world possessed one final champion he would challenge them to battle, slay them, and preside victoriously in his version of paradise; a wasteland of decaying corpses, in an absolutely ruined world.

Despite his savage nature, Yeenoghu is not stupid, being capable of subtlety and trickery, but merely choosing not to use it in most circumstances. He actively encourages the arrival of new races into his followers, recognizing the lack of his people's unity. Counting among the Lord of Savagery's favorite demons are barlguras, dretches, hezrous, maness, and especially maw demons and Shoosuvas, all appreciated for their bestial natures. With any entity that does not serve him he will not waste any time on discourse, leaping boldly into battle unless he becomes bored.

The Butcher

Weapon (flail), artifact (requires attunement)

Yeenoghu’s three-headed flail, the Butcher, is built from the bones and flesh of an ancient deity the Gnoll Lord murdered. Each rusty chain ends in a barbed head. The weapon screams with discordant laughter when swung. Those who are hit with more than one head of the flail can suffer from mental confusion and paralysis and it bleeds ichor when used in battle. The Butcher is one of Yennoghu’s most prized possessions, having been imbued with a part of the demon lord’s essence, and thus rarely leave its masters side. Only on extremely rare occasions does Yennoghu allow a champion to wield the great flail, but when he does, death and ruin on a grand scale is nigh. Yeenoghu’s bond with the Butcher is so strong that at any time, Yeenoghu can make the flail teleport to his claw, even if the Butcher is attuned to a different creature.

Attunement. Any creature besides Yeenoghu that tries to attune to the flail must make a DC 18 Constitution saving throw. On a successful save, the creature takes 45 (10d8) psychic damage. On a failed save, the creature undergoes a horrible and painful transformation that turns it into a Flind who’s goal is to protect The Butcher and serve Yeenoghu. Only by killing the Flind and casting either True Resurrection or Wish upon its body can the creature be transformed back into it’s true self.

Demonic Hunger. You can ravenously consume the corpse of a Small or Medium creature over the course of 1 minute, during which time you can do nothing but feast on the creature’s dead flesh. At the end of this time, the corpse is destroyed, and you regain 11 (2d10) hit points. You can also take 5 minutes to consume the corpse of a Large creature and regain 22 (4d10) hit points, 30 minutes to consume the corpse of a Huge creature to regain 33 (6d10) hit points, or 1 hour to consume the corpse of a Gargantuan creature to regain 55 (10d10) hit points.

Lord of Gnolls. You have advantage on any Charisma check towards gnolls. In addition, gnolls don’t attack you unless you attack them. You can also cast Dominate Person (3/Day) on gnolls.

Magic Weapon. You gain a +3 bonus to attack and damage rolls made with this ademantine weapon. The Butcher functions like a flail that deals (1d12) damage instead of (1d8). In addition, as a bonus action, you can choose to either summon the Butcher in one of your hands, or you can make the Butcher disappear until you use a bonus action to resummon it once more.

Random Properties

The Butcher has the following random properties:

• 1 minor beneficial property
• 1 major beneficial property
• 1 minor detrimental property
• 1 major detrimental property

Detrimental properties are ignored by Yeenoghu

Wrath of the Butcher. If it is your turn and you hit with the Butcher, then you can cause the target to suffer one of the following additional effects on a hit, each of which it can apply only once per turn:

Confusion. The target must succeed on a DC 18 Wisdom saving throw or be affected by the Confusion spell until the start of your next turn.

Force. The target takes an extra 13 (2d12) force damage.

Paralysis. The target must succeed on a DC 18 Constitution saving throw or be paralyzed until the start of your next turn.

Destruction. Since Yeenohu’s essence has been used to create the Butcher, destroying the mighty weapon is nigh impossible. The only way to destroy the weapon is to permanently destroy the lord of gnolls himself. If Yeenoghu is permanently killed, the flail crumbles into ash with an abyssal screech.