Battle of Ulthwe
Following the creation of the Great Rift, Craftworld Ulthwé dispatched nearly all of its forces across the Galaxy in an attempt to stem the tide of Chaos. Their warhosts came to the aid of not only the Imperium but also the Tau. However, this left Ulthwé itself highly vulnerable.
The Forces of Chaos took advantage of this weakness. Daemonic forces invaded the defenceless Ulthwé, breaching the craftworld’s surface to alight within the Dome of Crystal Portents. There, they are met in battle by the exiled Farseer Eldrad Ulthran and his faithful followers, along with warriors of the Ynnari and Harlequins. Despite the presence of Kairos Fateweaver and a sextet coven of Keepers of Secrets, the Eldar swiftly banished their foes.