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|Location =[[Duriel|Dûriel]]{{Fn|1}}

The '''Battle of DurielDûriel''', or '''Battle of Valedor'''{{Fn|4}} was fought by a coalition of [[Eldar]] led by [[Craftworld]] [[Iyanden]] and the remnants of [[Hive Fleet]] [[Kraken]] in 778999.[[M41]].{{Fn|1}} This was conflict is also known as the '''Red Death of Dûriel''' to the Eldar.{{Fn|1}}

[[Image:Valedor System (Battle of Duriel).jpg|thumb|right|300px|The Valedor System circa 999.M41{{Fn|4}}]]In the aftermath of the Craftworld's [[Battle of Iyanden (Kraken)|original battle]] with Kraken, Iyanden's [[Farseer]]s had created a [[Warp Storm]] to block the Tyranid pursuit. Hundreds of [[Bio-ship]]s had been caught in the tempest, and the Eldar had assumed them destroyed. However this was not the case, and thanks to the prophecies of [[Taec Silvereye]], Iyanden learned that Kraken's remnants had been returned to the [[Materium]]. Worse still, it seemed that Kraken's remains were heading towards [[Hive Fleet Leviathan]], and the Eldar knew that if the fleets were to combine the results could be catastrophic. The Eldar bio-information that Kraken had consumed could be merged with Leviathan's resources, creating an unstoppable strain of Eldar-Tyranid hybrids. Thus the Eldar surmised to stop Kraken once more, this time at the world of [[Duriel|Dûriel]]. Iyanden was soon aided by [[Biel-Tan]] and surprisingly the [[Dark Eldar]] of [[Commorragh]] in their efforts. [[Harlequin]]s were able to broker this alliance.{{Fn|2}} The Dark Eldar provided the solution to defeating the Tyranids: triggering a psychic device called the [[Fireheart]] that would destroy the core of Duriel Dûriel and all the alien beasts with it. However it could not be detonated remotely, so the Eldar knew that whoever stayed behind to activate the device would perish with DurielDûriel.{{Fn|1}}

Soon enough Duriel Dûriel had erupted into conflict as the [[Swordwind]] of Biel-tan arrived first and bore the brunt of the initial fighting. However Craftworld Iyanden soon came under attack despite not having reached their destination. The unthinkable had happened: the [[Webway Nexus]] on Duriel Dûriel had been compromised, sending swarms of Tyranids through it. Silvereye immediately ordered his [[Wraith-construct]]s to defend the Craftworld's own Webway gate and prevent Iyanden itself from being overrun. Soon enough Iyanden's [[Avatar]] was awoken and plunged itself into the Tyranid horde. With the aid of the mighty personification of [[Khaine]], the Eldar were able to push the Tyranids back into Iyanden's Webway gate and onto the surface of Duriel Dûriel itself.{{Fn|1}}

Iyanden's forces arrived to discover the final battle at Duriel Dûriel was already underway at a mountain known as Godspeak. Here Biel-tan's Farseers sought to activate the Fireheart as a force of Eldar and Dark Eldar fought to keep the Tyranids at bay. The Eldar under Chief [[Farseer]] [[Taec Silvereye]] fought to the last as the Fireheart was activated and Duriel Dûriel began to implode. As the planet exploded, [[Yriel]] led Iyanden's fleet against the Tyranid Bio-ships in orbit alongside Dark Eldar [[Attack Craft]] and finished them off, denying the fusion of Kraken and Leviathan. The Eldar had emerged victorious, but at heavy cost. Yriel had disappeared{{Fn|1}} and worse still, [[Taec Silvereye]] had perished in DurielDûriel's destruction.{{Fn|1}}