This undead horse was raised by Lolth herself as a favor to Robilard. The horse's fur turned jet black and its eyes are crimson red. While being ridden by its master, the horse can pass over difficult terrain as though it were normal. It can also "feather walk" across non-solid substances such as quicksand or lava. 

Hooves. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) bludgeoning damage.

Once per day, upon command from its master, the undead riding horse can erupt in purple flames. The rider (master only) is immune to the effects of the flames, but all other creatures within 5 feet must make a DC 12 DEX Saving Throw or take 3d6 necrotic damage. Success on the saving throw results in half-damage. The effect lasts 1 minute or until the master ends it.