The Rage of War fuels the primal powers of the Carrion Tribe that calls itself Razor Wind. These barbarians are one of the deadliest forces in the Demon Wastes, and, in the past, the tribe’s small numbers have kept them from posing a significant threat to the Ghaash’kala orcs who guard the gates of the Labyrinth. Now it seems that this has been a ruse—that the Razor Wind tribe has intentionally spread itself thin across the Wastes, and that it is pulling a great host together in the south. The barbarians have excavated one of Rak Tulkhesh’s soul-shards and are carrying it with them; this object enhances their primal powers and enables them to manifest demons to aid them in battle.
Source: Dragon 416
The barbarians of Rak Tulkhesh are one of the favourite toys of Mordakhesh the Shadowsword. The current leader wields a massive dragonshard weapon known as Peacekiller which contains part of the bound essence of Rak Tulkhesh; its mere presence incites warriors to a deadly rage, which they aim at the Ghaash’kala.
Source: Paladins of the Wastes