Embattled with two fire lizards and an enormous stone golem, Karthus never felt the tremors in the ground until it was too late and they had become thundering footsteps. He blocked off the nearby path with a wall made of the pure essence of pain and heard someone cry out as it dragged them to the ground. He turned to flee while his enemy struggled with the wall, but his retreat was blocked by a monstrous alien that reared up in front of him, an insectoid colossus with too many legs and clawed feelers and a feral grin. At that moment Karthus knew that he was dead. Well, re-dead.
The ground heaved and shuddered, and the bone-rattling roar of the Terror of the Void sounded the end of Karthus' life as the monster bore down on him. Cho'gath's mouth loomed over him, a pitch black expanse like the night sky, speckled with pointed stars. With a sickening crunch, the serrated teeth shattered Karthus' rib cage into a thousand pieces. He felt the shards breaking away, tumbling to the ground, and landing softly in the brush. The intimate touch of each blade of grass on the smooth ivory that had been the inside of his bones was titillating, and a tingle of pleasure wended its way up his scattered vertebrae. Dying always gave him a particular thrill.
Aroused energy surged through his remains as Karthus defiled the ground where the monster stood. He cast a wall across the bug's only path of escape, trapping it in the brush with his own remains and eliciting a scream that could curdle blood. Cho'Gath opened its cavernous maw once more, ripped away Karthus' robes with one swipe of its steel claw, and sank those shining teeth into the dead lich's pelvic bone.
Karthus could no longer control his own body, so only he knew how intensely he would have shuddered were he able to move. The wind moaned in sympathy with the jolt of ecstasy that flooded his now broken hips. Porcelain white chips of his ruined body fell down Cho'Gath's black throat and were vaporized in bursts of twisted bliss as the very Void itself consumed them. Karthus laid waste to the enormous creature, but his spells barely dented a single scale of its armored hide. His blatant helplessness against the beast devouring his body compounded his sensual rapture.
Gleaming crimson flowed from the mouth of the Void Terror, slithering its way toward Karthus' fallen skull. It resembled the blood of a living creature, but Karthus himself had no blood to spill. He realized just as it reached him that this scarlet snake was Cho'Gath's tongue, and then the sinuous appendage penetrated his eye socket and licked him from within. It writhed its way into the corners of Karthus' skull, filling him with its voluptuous length, violating his mind, ravishing his insides with an indescribable euphoria that felt like flame and ice together.
Karthus spent the last of his mana reserves on a final requiem, an orgasmic song of eerily beautiful moans and sighs that warped the vital energy of every living being. And as he came, the last thing he saw was Cho'Gath stomping away, ungainly yet oddly elegant, barely even cognizant of the eruption of dark magic that tore into every soul on Summoner's Rift.