Mists of Salamira
An evil spellcaster with a special bond to the True Mist
villain by and for Rayna
Whoever he is, he used to have a band of cloaked followers, a sort of a cult he could harass his enemies with. He was a leader, they looked up to him, they feared him, they followed him everywhere.
Now, thanks to the adventurers, he has nobody but himself.
And a deep, boiling hatred for the characters.