Shadowthrone (aka Waylander, aka Dakeiras)

Alignment: Chaotic Evil
Holy Symbol: Twin Daggers against a Shadow Tower
Portfolio: Death, Assassins

5E Domains: Death

Once known as the hero Waylander, and a follower of the Raven Queen, Shadowthrone thwarthed Orcus' plans to kill the Raven Queen, and stole the power of Death from her. Helped by the Spider Queen, he escaped the wrath of the other Gods, and ascended to Godhood.

He's currently a prisoner inside the sword Blackrazor, wielded by the warlock Tarlyn. (see here).