Innate Spellcasting. The oni's innate spellcasting ability is Intelligence (spell save DC 15). The oni can innately cast the following spells, requiring no material components:
At will: darkness, antimagic field
1/day each: bestow curse, cone of cold, blindness/deafness, sleep
Magic Weapons. The oni's weapon attacks are abyssal. If a creature takes damage from him it must make a Wisdom saving throw or be horrified for a turn.
Inflict Absolute Darkness. One creature must make an Intelligence saving throw or be blinded for two turns, there is no possible method of restoring vision during this time.
Multiattack. The oni makes three attacks, either with its claws or its greataxe.
Claw (Oni Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage.
Greataxe. Melee Weapon Attack: +7 to hit, reach 40 ft., one target. Hit: 15 (2d10 + 4) slashing damage, or 9 (1d10 + 4) slashing damage in Small or Medium form.
Change Shape. The oni magically polymorphs into an adult black dragon, into a Large giant, or back into its true form. Other than its size, its statistics are the same in each form. The only equipment that is transformed is its greataxe, which shrinks so that it can be wielded in humanoid form. If the oni dies, it reverts to its true form, and its greataxe reverts to its normal size.
Legendary Abyssal Spell (2/Day).
If the monster is unable to see an enemy, it can use one spell slot to obliterate every material object within a spherical 50 foot radius, except for powerful beings. Restores 20 HP.
Description
Legendary Abyssal Aura
During every turn that a creature has sight of the oni, they must make a Wisdom saving throw or go partially mad. The effect is permanent and will last with the creature until they die or have their mind restored with magic.
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