Kay Kāvus' Throne

Origin
Kay Kāvus is a mythological shah of Iran and a character in the Shāhnāmeh. Kāvus rules Iran for one hundred and fifty years, during which he is frequently though increasingly grudgingly aided by the famous hero Rostam. One famous tale relates how Kāvus chained four eagles and meat to his throne to achieve flight, flying all the way to China before landing and needing rescue from Rostam.

Effects
The throne will float higher and higher with each load placed upon it until fully loaded. Then, it will slice through the air and glide gracefully wherever it decides. It also maintains its forwards direction as whichever way the most amount of passengers are facing. A pair of spectral feathered wings and distant cawing can be heard while activated. Putting eagle feathers on it will neutralize the artifact dramatically, causing it to instantly lose all flight capabilities and plummet downwards. Also, it does not buffer well in adverse weather and will either be forced to land or blown off course.