The Spear of Twilight, known also as the Cursed Blade of the House of Ulthanash, is an eldritch artefact kept in a Stasis Field within the Shrine of Ulthanash on the Aeldari Craftworld Iyanden. This ancient weapon is said to contain the baleful energies of a dying sun, and is so powerful that it eventually burns through a bearer's soul.
The Spear, like other types of cursed artefacts, cannot be set aside by the owner willingly without death. Prince Yriel, Autarch and outcast of Iyanden, first used the potent Spear to slay a Hive Tyrant in a single blow and was forevermore bound by its curse. This creature was the leader of the Tyranid hordes of Hive Fleet Kraken that assaulted Iyanden in 992.M41. Yriel had been convinced to take up the cursed weapon by the Harlequin Shadowseer Sylandri Veilwalker of the Masque of the Veiled Path.
The Spear 's curse operates by slowly draining Yriel's life energy as he struggles to keep the artefact's power in check. The Spear of Twilight is actually a modified Singing Spear, the psychically-charged weapons similar to Witchblades that are often utilised by Eldar Warlocks.
During the final days of the 41st Millennium it was revealed by Yvraine, the leader of the Ynnari and the prophet of Ynnead, the Aeldari God of the Dead, that the Spear of Twilight was in truth one of the legendary Crone Swords needed to fully awaken Ynnead. Yvraine reverted the Spear to its true form as a sword and used it to resurrect Yriel by plunging it into his chest after he had fallen in battle defending Iyanden from an assault by the daemons of Nurgle.
- Codex: Eldar (6th Edition), pp. 54, 92
- Codex: Eldar (4th Edition), pp. 52-53
- Codex: Harlequins (7th Edition) pg. 34
- Codex: Tyranids (5th Edition), pg. 25
- Gathering Storm - Part Two - Fracture of Biel-Tan (7th Edition), pp. 70-76
- Iyanden: A Codex Eldar Supplement (6th Edition), pg. 34