Avonkul Martal

Avonkul Martal was, for his time, a progressive man with ideals laid out for the future of the drow into the centuries beyond his eventual death, to reform them into a military bloc unseen since the Empire and rebuild their shattered image in the eyes of the world. His marriage to Volia Dul-Sansiska was a great part of this, he'd supply the 'fearsome intelligence' and military command, and she'd supply the funding and unbridled charisma. He supported her all the way, but detested Divankul Dul-Sansiska as a wild dog unworthy of the suffix denoting a master of one's craft in the dark elvish language, eventually this all came to a head when Avonkl demanded that Volia shut up her loudmouthed brother once and for all by sending him off to some remote region in the alliance's domain so they could continue their plan in peace.
This did not go over well with Volia, who was aware that her baby brother had only ever been a liability, but was also her responsibility and as well he could be a truly decent statesman when given the correct tasks, she had a handle on his behavior, and could steer him to prevent major mishaps between nobility. He was a burden, but he was family, and despite all his failings, he was crucial for one part of the plan. Volia held power in an iron grip for some, and through sheer brutal charisma with others, but those west of Obscura she had little if any leverage one way or the other. But Divankul was strong enough to keep them locked into fear, or rather that's the image that was projected, and she needed that, beyond it being the one sibling she still had.
Avonkul would not accept this, found Divankul to be a horrible cancer to be cut out, set upon his plans, and with the help of House Sanistar, carried out the poisoning of his wife and of her mentally unstable brother. 
He should have just decapitated the man instead, and spared himself the torture that awaited.
*Blurbs*
Avonkul's eventual fate at the hands of his brother in law would be the most excruciating, not only was he made to bear witness to what Divankul had done to his Aldrin, but he was flayed alive as his co-conspirators screamed in torment around him. He would have his eyes plucked, his tongue torn out, and be deafened before he was flung somewhere far off in the north to freeze to death in sheer and utter agony, to this day this flayed body has never been recovered. Avonkul may have thought himself a brilliant man in his life, but he was a fool to mess with the delicate balance of power Volia had over her brother, and would be the core cause of the trials and tribulations that would follow for all of Terros with an unhinged maniac at the helm of the drow.