The Tower of Aratormindon predates The Reign of Eld, and was in fact raised by Armorcians. It is a chilly, imposing tower that sits atop the farthest eastern edge of the Eredrindë mountains, with views for dozens of miles in each direction.
The tower was designed to have a bonfire beacon on top of it to signal an invasion. Though it is traditional to light the beacon during The Bonfire Tower event each year in Orchalannon, it isn't kept in a state of readiness during the rest of the year. In the time of Armorcia, there was a constant vigil to warn of any invasion from the northern tribes.
Currently it is used as a nominal outpost for the Royal Highlanders. As it is also centrally placed and defensible, merchants who cannot travel far come here to offload their goods to the quartermaster of the tower. He gives very low buying prices, but is able to purchase in bulk. Much of the acquisitions made here are sent north in military caravans to fund war efforts, or west to supply Archet castle.