Ohgi Oni (5e Creature)
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Large giant, any alignment
Saving Throws Str +10, Dex +8, Con +12, Int +9, Wis +9, Cha +9
Brute. A melee weapon deals one extra die of its damage when the oni hits with it (included in the attack).
Indomitable (3/Day). The oni can reroll a saving throw it fails. It must use the new roll.
Innate Spellcasting. The oni's innate spellcasting ability is Charisma (spell save DC 17, +8 to hit with spell attacks). She can innately cast the following spells, requiring no material components:
Keen Senses. The oni has advantage on Wisdom (Perception) checks.
Magic Resistance. The oni has advantage on saving throws against spells and other magical effects.
Magic Weapons. The oni's weapon attacks are magical.
Multiattack. The oni makes three melee weapon attacks.
Claws (Oni Form Only). Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 18 (2d8 + 10) slashing damage.
Glaive. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 25 (3d10 + 10) slashing damage, or 20 (2d10 + 10) slashing damage in Small or Medium form.
Change Shape. The oni magically polymorphs into a Small or Medium humanoid, 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 glaive, which shrinks so that it can be wielded in humanoid form. If the oni dies, it reverts to its true form, and its glaive reverts to its normal size.
Etherealness. The oni magically enters the Ethereal Plane from the Material Plane, or vice versa.
The ohgi oni is a mostly human looking variety of oni with the ability to be just be a human and not a oni.