Trampling Charge. If the cursed stallion moves at least 20 feet straight toward a creature and then hits it with a hooves attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the horse can make another attack with its hooves against it as a bonus action.
Confer Fire Immunity. The cursed stallion can grant immunity to fire damage to anyone riding it.
Illumination. The cursed stallion sheds bright light in a 10- foot radius and dim light for an additional 10 feet.
Ethereal Stride. The cursed stallion and up to three willing creatures within 5 feet of it magically enter the Ethereal Plane from the Material Plane, or vice versa.
Multiattack. The cursed stallion makes two attacks with its hooves and one attack with its tail.
Hooves. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage plus 7 (2d6) fire damage.
Tail. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage. The target is grappled (escape DC 14) if the horse isn't already grappling a creature. Until this grapple ends, the target is restrained and takes 7 (2d6) piercing damage at the start of each of its turns. This attack cannot be used while a creature is already grappled.
Description
A cursed stallion is the result of a twisted transformation of a warhorse into something much more sinister. This is usually facilitated by a powerful wizard. The transformation results in a creature similar to a nightmare in looks but with a hard-coated carapace in place of skin and a large stinging similar to that of a scorpion growing where the horse's tail used to be.