Nightmare Spurs

Wondrous item, very rare (requires attunement)

These dark boots are made with leather from a nightmare. While wearing them, you have resistance to fire damage, and you can cause harmless embers to spark from your heels when you walk (no action required).

Dread Aura. You can use a bonus action while wearing the boots to begin emitting an aura of dread with a 30-foot radius. Hostile creatures within the aura that can see you have disadvantage on saving throws against being frightened, and you can use a bonus action on each of your subsequent turns for the duration to force any hostile creatures within 10 feet of you make a DC 16 Wisdom saving throw or become frightened of you until the start of your next turn. This aura lasts for 1 minute or until you're incapacitated. For the duration, your steps sound like hellish chains being dragged across the floor. Once this property has been used, it can't be used again until the next dawn.

Hellfire Steed. You can use an action while wearing the boots to summon a nightmare in your space, immediately becoming mounted on it (provided it is at least one size larger than you); this effect fails if there isn't enough space for it to appear. The nightmare is equipped with a saddle, bit, and bridle, which vanish when it disappears. The creature is bound to you for as long you remain mounted on it, and it is friendly to you and your companions. The nightmare disappears if it's reduced to 0 hit points or if you end your turn without being mounted on it. This nightmare can't use its Ethereal Stride action. Once this property has been used, it can't be used again until the next dawn.

For every black hat, a dark heart, and a darker horse.