Oni

, misleadingly called ogre mages, were a distantly related type of giantkin possessing innate magical abilities.

Appearance
In their true form, oni are large and muscular yet blubbery demonic ogres; their heads have two ivory horns, and their blue or green hairless skin is a tough and rhino-like hide. Their eyes are dark with strikingly white pupils, and their teeth and claws are jet black.

Oni can shapechange into any other Large giant or any Medium or Small humanoid, though they keep their original statistics and even in humanoid form they have noticeably heavy footsteps.

Actions

 * Shapechange
 * Multiattack: two attacks, either with claws or with glaive

Innate Spellcasting
At will:
 * Invisibility
 * Darkness

Once per day:
 * Cone of cold
 * Sleep
 * Charm person
 * Gaseous form

Known Oni

 * Lorenzo - The leader of the Iron Shepherds.Episode 144-Kerri Airken-Beau-Lorenzo.jpg

History
Oni were banished by highborn giants from the giant caste system.

Children's nursery rhymes in Wildemount include cautionary stories in which oni steal away children at night, as a means of scaring children into staying home.

Lorenzo and the Iron Shepherds
One of the Mighty Nein's most dangerous early enemies was an oni. As part of a job for the Gentleman, the Mighty Nein were traveling up to the Shadycreek Run area to meet up with the Gentleman's business associate, Ophelia Mardoon, when the Iron Shepherds, a band of slavers operating out of Shadycreek Run, kidnapped Yasha, Fjord, and Jester. When the rest of the Mighty Nein and Keg attempted to ambush the Shepherds on the road before the slavers could return to their stronghold, the slavers' leader Lorenzo killed Mollymauk Tealeaf. The surviving free members of the Nein and Keg added Nila to their group and continued on into the Shadycreek Run area. There, they met with Ophelia Mardoon, who turned out to be a rival of the Iron Shepherds. Mardoon asked them to discreetly eliminate the Shepherds and suggested that they ask for the help of local priest Caduceus Clay, who joined the party. They infiltrated the Iron Shepherds' base, the Sour Nest, discovered that Lorenzo was a disguised oni, and killed him and the other Shepherds.