Never trust a prophecy-there's always a sneaky bastard hiding behind an Anti-Psyker Shield
Unlike the Drukhari, who frantically tortured other souls to prolong their lives, the Craftworld Aeldari used a relatively "gentle" method to evade Slaanesh.
They restrained themselves through "discipline and abstinence," establishing extremely elaborate rules for every profession and obeying them strictly to distance themselves from the desires under Slaanesh's dominion.
Freedom from desire meant a longer life. They chose a profession, reached its pinnacle, then moved on to another.
Everyone wore a Spirit Stone, a vital treasure in their struggle to wrest souls from Slaanesh. When a Craftworld Aeldari died, there were only two possibilities: their soul would be devoured by Slaanesh or enter their Spirit Stone. Their comrades would bring the stone back to the Craftworld and place it in the infinity circuit. Countless ancestral Aeldari souls therefore dwelled within the infinity circuit, offering their successors experience. In times of crisis, their souls could also enter specially constructed wraithbone "mechs," becoming Wraithguard or Wraithlords to continue fighting for the Craftworld.
What was wraithbone? It was the Aeldari's primary material, created by Bonesingers using energy drawn from the Warp. Infusing it with psyker power allowed its shape to change at will. It was used in almost every device imaginable: armour, weapons, ships, even entire Craftworlds. It could also serve as an energy source, provide protection, repair itself when infused with psyker power, and much more.
The problem was that Bonesingers were scarce. Using psyker power was dangerous for the Aeldari, so wraithbone was hardly plentiful.
Eulusia, captain of the small pirate band that had just appeared, came from Vyzik Craftworld. She had been expelled for disobeying certain rules of the Path of the Warrior.
Aelos, whom she had contacted, was her uncle. He was no professional pirate, but a powerful warrior immersed in the Path of the Warrior. He and