Unidentified oni

An oni was responsible for a series of missing children incidents in Westruun, Tal'Dorei in 812 PD. So far, it has neither appeared nor been mentioned onstream.

Description
This oni was sadistic and clever at covering their tracks. Like most oni, it was lawful evil.

History
In 812 PD, the oni was responsible for a series of missing children incidents in Westruun, as well as an, to the people of Westruun, unrelated series of nightmares plaguing people of all ages. Magical experts were sought to look into either matter, although the oni was able to cover their tracks well.

Oni abilities

 * Flying speed of thirty feet per round
 * Darkvision for sixty feet
 * Innate spellcasting: The oni was able to innately cast the following spells without material components.
 * At will:
 * Darkness
 * Invisibility
 * 1/day each:
 * Charm Person
 * Cone of Cold
 * Gaseous Form
 * Sleep
 * Magic weapons: The oni's attacks were magical.
 * Regeneration: The oni regenerated every round as long as they were conscious.
 * Actions:
 * Multiattack: The oni could make two attacks per turn with their claws or glaive.
 * Claw: A melee weapon attack that dealt slashing damage; usable in the oni's true form.
 * Glaive: A melee weapon attack with reach that also dealt slashing damage; usable in either form, albeit weaker in their humanoid disguise.
 * Shape Change: The oni could magically polymorph into a small or medium-sized humanoid, a large-size giant, or back into their true form as an oni. With the exception of its size, their statistics remained the same, and their glaive shrunk to match the humanoid form. Upon death, the oni and glaive would revert to their true form and size, respectively.

Equipment

 * Chainmail armor
 * Glaive