Aieridyn is the guardian who watches over the creatures of the day when they venture forth into the night. To those afoot at night, he is the bright star that shines above, and he brings the close of night with the coming of dawn.

The Watcher is the son of Burthaggid and Isbri. He has the neutral bent of his father, and inherited his mother's love of the open sky. Aieridyn has favorable relations with Lhuramni, Zandaron, Tayne, and Throntis, and he has sworn allegiance to Vendaneran. The Watcher is wary of Sethanit, and is careful of his mother. He is also the sworn enemy of his sister, Alchenda.

The Watcher has been known to manifest himself as a brilliant light in an area of darkness, but this is usually against non-believers. To his flock, Aieridyn is a dark skinned humanoid figure, with features indiscernible beneath a low-hanging cowl. Common titles for Aieridyn are the Watcher, Dark Guardian, and Dawn-Bringer.

The clergy of the Watcher are seen as the travelers in the night. They can often be found in waterfront settlements, where they employ their navigational skills. Aieridyn's priests are highly prized as navigators for ocean-going vessels. It is common superstition that Aieridyn watches over ships carrying his priests, and asks Naultan to grant them safe passage.

Aieridyn's temples are always located above ground. Large temples are often found in cities and towns, and smaller temples and shrines abound in smaller settlements. Most of the Watcher's temples are stout constructions of wood and stone, and all possess open courtyards for ceremonies beneath the full moon.