They struck a deal with the powerful MahjarratSliske to become more powerful, not realising that Sliske had a devious plot behind the offer and thus were tricked by him. Sliske observed their strength, and when he thought them worthy, he allowed them to weaken, and then awaited the time for them to die; after their deaths, Sliske came to "collect" them, and they were buried in six burial mounds, or barrows, in eastern Morytania, giving them their collective name. Even after their deaths, they serve Sliske as wights.
Their ages are shown by their names, the first alphabetically being the oldest (Ahrim), and the last alphabetically being the youngest (Verac). The brothers are the strongest of Sliske's wights, and their name is derived from their last resting place, now known as the Barrows.
The brothers are summoned by their master Sliske during the 18th Ritual of Rejuvenation. Arriving at the Ritual Plateau, they initially fought off the Armoured Zombies under the control of Zemouregal. After they defeated the zombies along with the player, Sharathteerk under Zemouregal's orders summoned the hero of Varrock, Arrav. In this battle of the undead, Arrav had the upper hand - such was his might that the Barrow wights were unable to harm him. Arrav ceased fighting the brothers after the player distracted and led him to the area where his heart was buried, causing him to break free of Zemouregal's control.
After the ritual, Sliske, having been impressed by the player's prowess, attempted to convert the player into a Barrow wight. His conversion spell was however intercepted by Akrisae; thereafter known as Akrisae the Doomed - the newest of Sliske's Barrow wights.
During the 'Grand Ascendancy' - a gathering of gods arranged by Sliske - the Barrows Brothers and Akrisae were summoned to the Empyrean Citadel to bar access to the meeting chamber from non-divine beings such as Zemouregal, who attempts to force his way through, but is denied by the power of Sliske. Shortly after the meeting, Sliske experimented with the Barrows Brothers in the Shadow Realm, granting them extra powers and some control of it.