Multiattack

The nightmare makes two Flaming Hoof attacks.

Flaming Hoof

_Melee Weapon Attack:_ +6 to hit, reach 5 ft., one target. _Hit:_ 7 (1d6+4) bludgeoning damage plus 7 (2d6) fire damage.

Ethereal Stride

The nightmare and up to three willing creatures within 5 feet of it magically enter the Ethereal Plane from the Material Plane, or vice versa.