Liadrin/Tae'thelan. Evil!Liadrin AU.
When Prince Kael'thas had sent them the Na'aru it had seemed like progress, and Tae'thelan had of course asked to be able to study it, when Liadrin had agreed he had imagined visiting the Hall of Blood a few times, documenting what data he could collect for posterity and then returning to the Reliquary. He didn't expect observing change of a different kind, watching the Blood Knights as Liadrin led them from being fallen wielders of the Light to the new Light they siphoned, as Liadrin slowly advocated harsher and harsher methods of training, of dealing with failures, as training spars turned to duels to the blood. The new Light was a hard light, harsh and cold, Tae'thelan discovered, when Liadrin fisted a hand in his hair and dragged him away from the table he had be allowed for his research, twisting his head to look at her the best he could over his shoulder, "Tae'thelan," she said, and the Light was in her eyes now, hard and cold and possessive, "What exactly is the Reliquary's interest in the Na'aru?"
Liadrin can't tolerate Tae'thelan's presence any longer, the Na'aru belongs to the Blood Knights, and while at first she had felt the Reliquary's request for study was perfectly reasonable that was before. Before she had understood, how important the Na'aru was for them, they needed it, and she couldn't risk some self-important Magister trying to take it away for 'further research'. She knew what Tae'thelan was here for now, to steal the power from them, to make them fall again for his own gain, but Liadrin would show him, she'd show him who the Na'aru belonged to, she'd show him who all the 'data' he'd collected really belonged to. There were only a few feet between that interloper and herself now, she eyed his long, perfect hair and snarled silently, she would show him.
Notes: (okay, now imagine her pinning him to the research table and having her way with him right underneath M'uru. yeah)