Biel-Tan - Notable Events: The Voyage Begins (ca. M29) - Iyanden is one of the first craftworlds to escape the failing and corrupt Aeldari Empire.Fall of the Aeldari (ca. M30) - The Aeldari Empire is torn asunder as Slaanesh is born from their depravities.An Alliance Fades (777.M34) - Craftworld Biel-Tan begins a bloody war to reclaim the Maiden World of Rasilena from the encroaching humans. Iyanden, judging that reclaiming Rasilena brings no benefit in the ongoing war against Chaos, refuses to send aid, even when two whole sector fleets and ten Space Marine Chapters join the fight. Biel-Tan eventually emerges bloodied, but victorious. Thereafter, the two craftworlds soon lose their unity of purpose, each assuming the other to be uncommitted to their alliance.The Pyre of Killiak's Bane (838.M41) - Imperial xenologists begin to plunder the buried artefacts of the Aeldari Maiden Kiliak, triggering a devastating response from the nearby Aeldari craftworlds of Biel-Tan and Ulthwé. After a confirmed sighting of the Phoenix Lord Jain Zar and over a hundred Howling Banshees disciples, the Imperial interlopers are killed to a man, incinerated, and their ashes scattered to the wind.Battle of Orar's Sepulchre (888.M41) - An Aeldari emissary from Craftworld Biel-tan was sent to the Imperial world of Commrath to enter negotiations with its Planetary Governor for the return of an ancient eldritch artefact from the tomb of one of the Ultramarines' most-lauded heroes, Captain Orar, known as the Sceptre of Galaxian. When the Imperial noble refused his request, the Aeldari emissary grew angry and soon his pleas turned to threats of violence. The Planetary Governor refused to be cowed by the arrogant xenos and had the Aeldari executed on the spot. However, the Governor had the foresight to heed the Aeldari's threats and requested aid from the Ultramarines. Aeldari from the Alaitoc and Iyanden craftworlds then proceeded to assault the planet Commrath to recover the Aeldari artefact within Orar's Sepulchre. Orar was a great Ultramarines hero in the aftermath of the Horus Heresy, and Chapter Master Marneus Calgar vowed not a single alien would breach the sanctity of his tomb. For the first time since the Battle of Macragge, Calgar lead his entire Chapter to war. The Aeldari descended upon Orar's Sepulchre to find it held against them by the Ultramarines. Aeldari Aspect Warriors and Guardians darted towards the main gates of the great edifice that was Orar's tomb as grav-tanks and artillery engines battered the Imperial defenders. On Calgar's command, the Ultramarines emerged from cover and scoured the invaders from the Sepulchre's steps with disciplined Bolter volleys. The Aeldari fell back, only to find their lines of retreat cut off by Assault Marines and Land Speeders. Aeldari leaders emerged from cover and rallied the trapped first wave, only to fall to sniper fire as the Ultramarines' Scouts made their presence known. The initial Aeldari assault faltered but, for an entire day and night, they continued to attack. Though they mustered every arcane science at their command, they could not overcome the tactical brilliance of Marneus Calgar and his Ultramarines. The following day, a fresh assault swept onto the great stairs of the sepulchre, led by a colossal figure wreathed in flame -- an Avatar of Khaela Mensha Khaine, the Aeldari god of war. Heavy weapons fire seemed only to anger the creature, and the Ultramarines' battle line buckled beneath its onslaught, so Calgar issued a challenge himself. The fiery god bellowed with fury, its first blow missing the Ultramarines' Chapter Master by a hair's breadth. The second tore plates from Calgar's armour. A third bit deep into his shoulder, driving the Chapter Master to one knee. But the fourth slammed into the armoured palm of Calgar's left hand. Rising up, Calgar struck with all his strength, bringing his other gauntlet around in a mighty arc that punched clean through the molten ichor of the Avatar's torso. With the fall of their war god, the Aeldari lost all heart and retreated. Some fled without heed while others fell back in good order, but all of the xenos retreated into the darkness. Despite overwhelming odds, once again the Ultramarines had emerged victorious, but in his wisdom Calgar knew that the Aeldari would return for the Sceptre of Galaxian. So it was that Calgar informed Commrath's Governor that the Galaxian Sceptre would be removed from Orar's Sepulchre to Macragge, where it could be properly defended.Dishonourable Alliances (909.M41) - A vast Imperial force comprised of the 52nd and 124th Valhallan Imperial Guard regiments leads an invasion of the ice planet of Klaihn. To prevent a sacred Aeldari Temple of Isha from falling into the hands of the Imperium, Biel-Tan and Lugganath each field their most potent Ghost Warriors and Aspect Warriors in a unified force. Partially because of the strange, ethereal blizzards that plagued the world, and the stubbornness of the Valhallans, what was intended to be a fast strike results in a protracted and exhausting conflict. Eventually, the Aeldari reach the temple and encircle it with Ghost Warriors, only for a Warp-blizzard to bring new terrors in the form of a wave of Daemons. An uneasy alliance is struck between the Aeldari and the Imperial forces to purge the planet of frost-blighted Slaaneshi Warp-horrors. However, the Aeldari have a greater plan, and lure the Daemons and Valhallans into a bloody conflict against each other that greatly reduces the numbers of each. Though the Valhallans are finally victorious against the Warpspawn, the Ghost Warriors easily rout the exhausted Imperial survivors.The Devourer Descends (992.M41) - The Tyranids push their tendrils into the galaxy, and Craftworld Iyanden is locked in a death-struggle against the mighty Hive Fleet Kraken. As the craftworld teeters on the brink of extinction, more and more Ghost Warriors are summoned to its defence, until the army facing the Tyranids is as much of the dead as the living. Biel-Tan sends a small warhost to help fight against the Great Devourer, and acquit themselves well against the chitinous swarm. But in the end, they are all slaughtered by the innumerable creatures.The Red Death of Dûriel (778.999.M41) - The Aeldari of Iyanden and Biel-Tan combine with Drukhari forces to prevent the biological union of Hive Fleets Kraken and Leviathan upon the Maiden World of Dûriel. They are successful, but Dûriel itself is sacrificed to ensure victory, through means of an arcane device known as the Fireheart. In the wake of the battle, Prince Yriel disappears.The Bio-Purge Continues (811.999.M41) - Encouraged by their successes against the Tyranids at Dûriel, the Asuryani of Iyanden and Biel-Tan bring the Fireheart to other worlds. Thus do they begin a campaign of planetary annihilation in order to starve Hive Fleet Leviathan as it advances. The two craftworlds then take part in the incineration of dozens of Imperial and Ork-held worlds in and around the Octarius System. By swiftly establishing beachheads and activating a modified version of the psychic doomsday device used to destroy the Tyranid-infested planet of Dûriel, the Aeldari ensure that no shred of biomass is left intact. Countless worlds, many of them inhabited, are scoured clean of bio-mass in the ensuing campaign. Though the Imperium rages at the slaughter, blindly venting its wrath upon any xenos spaceship within a dozen parsecs, Hive Fleet Leviathan is denied crucial bio-resources as a result. A short time after, a major part of the hive fleet is isolated and destroyed by interlacing Aeldari attacks.Battle of Biel-Tan (ca. 999.M41) - See above for a more complete description of the Battle of Biel-Tan and the fracture of the world-ship.Exodite Alliance (Unknown Date.M42) - In the wake of the fracture of Biel-Tan and the recruiting drive of the Ynnari, the great world-ship has lost almost half of its military forces and has been forced to become more of a fleet of smaller ships rather than remain as one colossal vessel. Civil strife become srampant as the Biel-Tani disagree over the course that they should take in the new era. To restore its military strength, Biel-Tan begins to recruit Exodite warriors to serve with the Swordwind after the Biel-Tani free three Exodite worlds known as the Three Sisters from attacks by the forces of Chaos with the aid of the Phoenix Lords Baharroth, Fuegan and Karandras. Long isolated from wider Aeldari affairs, many Exodites now feel that with the existence of their species truly at stake, the time has come to fight alongside their Asuryani brethren.