I'm featuring the Rotten Vale in a DnD oneshot. Here's what I got so far. Note that I don't plan on having them face Raodobann or Great Girnos and its for a level 20 party. It's also gonna be my first time being a DM. Anyways let me know what you think and sorry for the wall of text. Girnos stats! HP: 50 Strength: 11 Dexterity: 12 Constitution: 12 Intelligence: 4 Wisdom: 5 Charisma: 0 Slash: the Girnos slashes at a target, dealing 1d10 slashing damage on a hit. Bite: the Girnos attempts to bite its prey, dealing 1d6 piercing damage on a hit. If hit target must make a Constitution saving throw, if failed target is paralysed for 2 turns. Odogaron stats! HP: 1200 Strength: 19 Dexterity: 20 Constitution: 18 Intelligence: 0 Wisdom: 0 Charisma: 0 Resistances: Fire, Water, Poison. Weaknesses: Cold, Paralysis. Bite: the Odogaron attempts to bite for 3d8 piercing damage. Slash: the Odogaron slashes at its prey dealing 4d10 slashing damage on a hit, if hit target must make a Constitution save, if failed, target is now bleeding for 1d10 bleeding damage every turn for 4 turns. Pounce: the Odogaron leaps at it prey, knocking it down on a hit, and deals 3d8 piercing damage until knocked off. Odogaron will continue to attack the pounced party member until it is knocked off, the pounced target succeeds a Strength throw, or the target is dead. Tail Whip: the Odogaron slaps enemies behind it with its tail, dealing 4d6 bludgeoning damage on a hit. Roar: the Odogaron can use its bonus action to roar, all humanoid creatures within 30 feet must make a Constitution saving throw, if a creature fails that creature is stunned until next round. Vaal Hazzak! The Corpse Coat Dragon stats! HP: 3482 Resistances: Lightning, Poison, Sleep, Paralysis. Weaknesses: Fire. Strength: 20 Dexterity: 20 Constitution: 20 Intelligence: 20 Wisdom: 20 Charisma: 0 Effluvium Beam: Vaal Hazzak breaths a beam of pure Effluvium in a 60 degree arc starting from its right. All targets hit make a Constitution saving throw. Targets take 4d20 necrotic damage on a failed throw or half as much on a successful throw. Effluvium Mist: Vaal Hazzak can disperse the Effluvium built up in its body into a mist covering 30 feet surrounding it lasting for 3 turns. Anyone in this mist must make a Constitution saving throw. On a failed throw, max HP is cut in half for 5 turns and take 1d6 necrotic damage for every turn they spend in the mist. Effluvium Mist Beam: Vaal Hazzak fires an Effluvium Beam at the ground, dealing 1d20 necrotic damage to anyone caught by it. This attack applies the effects of Effluvium Mist. Effluvium Drain: Vaal Hazzak can drain the Effluvium from any nearby creatures with the status "Effluvium Corruption", healing Vaal Hazzak for 1d12+6 for every creature drained. This move kills any creatures drained. Bite: Vaal Hazzak bites at its target, dealing 2d12 piercing damage on a hit.