Magic Items

Obsidian Steed (Very Rare). This polished obsidian horse can become a nightmare for up to 24 hours. The nightmare fights only to defend itself. Once it has been used, it can’t be used again until 5 days have passed.
If you have a good alignment, the figurine has a 10 percent chance each time you use it to ignore your orders, including a command to revert to figurine form. If you mount the nightmare while it is ignoring your orders, you and the nightmare are instantly transported to a random location on the plane of Hades, where the nightmare reverts to figurine form.

Weapon (any sword), rare (requires attunement)
You can use a bonus action to speak this magic sword’s command word, causing flames to erupt from the blade. These flames shed bright light in a 40-foot radius and dim light for an additional 40 feet. While the sword is ablaze, it deals an extra 2d6 fire damage to any target it hits. The flames last until you use a bonus action to speak the command word again or until you drop or sheathe the sword.
A character attuned to this sword can use an action to mentally command it to detect gems and jewels. Someone who does so learns the kind and number of such objects within 60 feet of the sword.

Includes a Top Hat

The core plates of a larger suit of armor, covered in netherese runes.

While wearing this hat, you can use an action to cast the disguise self spell from it at-will. The spell ends if the hat is removed.

This item is found on Magic Item Table F in the Dungeon Master’s Guide.

The entire length of this broad, red-silk ribbon is embroidered in gold thread. While wearing it, the wearer can read and understand, but not speak, Undercommon.