Desperate measures
Braeszon was a great Eldar seer, yet he was not the greatest among them. Talented yes, but only enough to become great. Experienced, yes, but far from the oldest among the eldar. A hero, yet not a legend. So in retrospect it is perhaps unsurprising that he was the first among the seers to be detected in Nurgle's garden, not even halfway through the defenses.
"Oh, now who is this?" A fatherly voice asks.
Braeszon whips his head around and stares at his new foe. A Greater deamon of Nurgle, a Lord of Decay. A powerful foe, but not one that would be impossible to escape from, with the right preparations. Preparations he had taken, of course.
"Nothing much." He replied, edging away from his newest foe.
"Trying to take advantage of the, ahem, chaos to sneak a peak, are you young man?" The monster beyond sanity continues kindly. "Well, if you want to understand the good father that much, come with me. I'll ensure you learn all about the kindness of Papa Nurgle."
"I must decline." Braeszon replies, reaching behind him and drawing a blade.
A simple sword, forged of steel falls into his hands. Once a blade of purity, of faith, it is now a twisted and corrupted thing, its power twisted by the thing its master slew and bound to it so long ago. Braeszon feels its whispers the moment it leaves its sheath, which itself is yet another legendary artifact, forged by a shard of Vaul to temporarily restrain the deamon within. He raises the blade over his knees.
"Now son, lets put the sword down and we can talk about this." the daemon starts
Braezon brings his hands down, driving ancient steel against modern wraithplate. Bound to a daemon or not, the steel loses. And the deamon within is released once more.
"Who dares to summon the Master of Masters, the Deliverer of Darkness, the Shogun of Sorrow, Aku?" The deamon thunders as it cries its freedom to the world. "Without that foolish Samurai no one shall... wait a minute." The demon trails off, its eyes blinking in confusion. "This is Nurgle's Garden." He turns on the Eldar. "Why did you release me, a Lord of Change, in Nurgles garden?"
"I need a distraction." Braeszon replies without shame.
"I hate you." Aku replies flatly, his beard smoldering with wraith.
"Just as planned." Braeszon replies, a grin on his face.
"Nice one." The Great Unclean One laughs in amusement.
For a moment out of time the three pause at each other. Then Braeszon and Aku bolt in opposite directions, scrambling desperately for safety. And the lord of Nurgle, acting according to its nature, charges after Aku.
A/N: 40k, where you deliberately unleash Aku as a distraction.
@Durin