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Originally posted by Pitiless_One

A quick conversion from the Wizards of the Coast conversion guide.
https://media.wizards.com/2015/downloads/dnd/DnD_Conversions_1.0.pdf

Ultimately, the body taken changes the CR to some degree as the damage can change as a result. As is, most of the common combinations fit into somewhere around CR 8-10. Ill be aiming for 8, but for higher just increase anything that uses proficiency by +1. It would be helpful to have the level of your party and how difficult you want the encounter to be, but this should get you started.

Avatar of Bhaal
medium undead, neutral evil

AC: (Calculate based on armor worn, shield, and Dex as normal)
HP: 138 (12d8+84)
Speed: 30 or 35 feet

Use the same ability scores: Str +6, Dex (as the body), Con +7, Int +3, Wis +4, Cha (as body)

Most of the Rest is just flavor and you have a little discretion

Saving Throws: Str +9, Dex (body Dex +3)
Skills: Athletics +9, Deception (body cha +3), Intimidation (body cha +3), Stealth (body Dex +3)
Damage Immunities: necrotic, poison
Condition Immunities: charmed, frightened, paralyzed, petrified, poisoned, unconscious
Senses: darkvision 120 ft., passive Perception 14
Languages: All

Aura of Murder. As long as the Avatar is not incapacitated, hostile creatures within 5 feet of it gain vulnerability to piercing damage unless they have resistance or immunity to such damage.

Legendary Resistance (3/day): If the Avatar fails a saving throw, it can choose to succeed instead.

Magic Resistance. The Avatar has advantage on saving throws against spells and other magical effects.

Regeneration: The Avatar regains 5 hit points at the start of his turn and has at least 1 hit point. If the Avatar takes Radiant damage, a critical hit, or is exposed to sunlight, this trait doesn't function at the start of the Avatar's next turn.

Undead Fortitude: If damage reduces the Avatar to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit, or if it is in direct sunlight. On a success, the Avatar drops to 1 hit point instead.

Death Leap: As a reaction to being brought to 0 hit points or being forced from a host body, the Avatar can attempt to leap into a live body within 10 feet. The target must make a DC 16 Wisdom saving throw or become possessed, changing the statistics accordingly. The Avatar gains hit points equal to the current hit points of the host body and the regeneration trait doesn't function on its next turn.


Actions
The damage here needs to be pumped up a lot. In general, go with whatever the body has, and then change the modifier and the Strength bonus to fit. The Aura of Murder will help a lot if he gets his hands on a piercing weapon or uses claws or bites or something.

Multiattack: 2 to 3 attacks should be fine, depending on the difficulty. The goal is to get the expected damage about right on the CR table from the DMG.

Claws (no Weapon): +9, one target, 5 ft. ON hit: 9 (1d6+6) piercing (x2 if the Aura applies). Avg Damage (36 per turn, 54 through legendary actions).

A thematic recharge ability.

Legendary Actions
3 legendary actions per turn
- A single Attack
- Move without provoking an opportunity attack
- Something else cool like pounce to try to knock someone down or grapple. If its strong, make it cost 2 actions.

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Example changes, as if he took over a Noble:
- AC: 15
- Dex 12 (+1), Cha 16 (+3)
- Saves: Dex +4
- Skills: Deception +6, Intimidation +6, Stealth +4
- Rapier: +9 to hit, 11 (1d8+6) piercing damage. (22 if aura applies).

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