Darkvision: 60 feet.

Horns: Minotaur can use their horns to make unarmed strikes. On a hit, they deal 1d6 + Strength modifier piercing damage.

Arcane horns: Oni learn Thaumaturgy cantrip. At 3rd level, they can cast Hellish Rebuke once per long rest.

Goring charge: If Minotaur move at least 10 feet straight toward a creature and then hit it with a melee attack on the same turn; they can use a bonus action to make a horn attack.

Labyrinthine recall: Minotaur can perfectly recall any path they have traveled.

Oni blood: Oni are also considered to be Fiends for spell effects.