Cyric

The monomaniacal Faerunian god of lies, trickery, and strife, having previously held dominion over tyranny, murder, lies, intrigue, and illusion. It was the unholy radiance of the Dark Sun that drew power-hungry mortals to their inexorable deaths like moths to a flame, and it was the Prince of Lies who murdered Mystra and caused the Spellplague, throwing the cosmos into turmoil in an act that cost him much of his following.