Battle of Iathglas
The Battle of Iathglas took place sometime after the creation of the Great Rift.
On the maiden world of Iathglas, Yvraine of the Ynnari convenes a council between the major craftworlds, alongside representatives from the Harlequins, many Exodite worlds, three renowned Corsair fleets and even the Dark Eldar. The assembled Eldar fall to arguing before a common threat, a Chaos incursion, unites them. The combined forces of the Eldar are soon triumphant, and despite being presented with such a practical example of how an alliance would be to their benefit, they part ways no closer to reaching an accord.