Oni

The monster regains Hit Points at the start of each of its turns if it has at least 1 Hit Point.

The monster makes two or attacks. It can replace one attack with a use of .

. .

. , and the target has the Frightened condition until the start of the monster's next turn.

The monster shape-shifts into a Small or Medium Humanoid or a Large Giant, or it returns to its true form. Other than its size, its game statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed.

The monster casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC ):
1/Day Each: Charm Person (level 2 version), Darkness, Gaseous Form, Sleep

The monster casts Invisibility on itself, requiring no spell components and using Charisma as the spellcasting ability.