Oni Mask

Wondrous item, legendary (requires attunement)

This garish two-sided mask is painted to resemble a grotesque three-eyed oni with a wide tusked maw, painted bright red in a snarl of rage on one side and cool blue with a smirk of contempt on the other. You can toss the mask into the air while designating one opponent within 200 feet. The oni mask then swells up in size to become a massive leering oni face 10 feet across made of magical force. The face has an Armor Class of 20, hit points equal to your hit point maximum, a Strength score of 26, and a Dexterity score of 10. If it drops to 0 hit points, the mask shrinks in size and flies back onto your face. The oni face attempts to push a creature within 5 feet of it in a direction you choose. Make a check with the face’s Strength contested by the Strength (Athletics) check of the target. If the target is Medium or smaller, you have advantage on the check. If you succeed, the face pushes the target up to 5 feet plus a number of feet equal to five times your spellcasting ability modifier. The hand moves with the target to remain within 5 feet of it. You can redirect the target of the oni face or summon it to return to your face as a bonus action.

You can enlarge yourself as the Enlarge option of enlarge/reduce, taking on a horrific and monstrous appearance like a oni, gaining advantage on Charisma (Deception) ability checks to appear as a real oni for 10 minutes. You can read, speak, and understand Giant while in this form. Choose either the red face to show, or the blue face. If the red oni face is showing, you gain resistance to fire damage. If the blue face is showing, you instead gain resistance to cold damage. At any point while transformed you can expend one minute of remaining duration as a bonus action to launch a ray of energy at a target within 60 feet as a ranged weapon attack, dealing 4d6 fire damage (red mask) or cold damage (blue mask) to the target. Once you use this ability, you cannot use it again until you complete a long rest.

Epic Attunement. The duration of your transformation into a monstrous oni lasts for 10 hours rather than 10 minutes; however, launching a ray of energy consumes 1 hour of your remaining time. The ray of energy deals 6d6 damage of the appropriate type and ignores any resistance or immunity that fire and cold damage.