When they're all ****, the right to choose not to follow any of them should not be infringed.
He did. If you're familiar with some of the minutae of FR lore (as I am, o yah) you'd know that the Crown of Horns was a powerful artifact (like, awesomely powerful even for an artifact) that eventually possessed those who wore it, as artifacts tend to do. One of the seven sisters got ahold of it and was possessed by Myrkul for a few years, and then the rest of the sisters and Khelben "Blackstaff" Arunsun destroyed it, thus "killing" Myrkul (I think). Mask had a similar trick with the Godsbane shortsword and Cyric ended up breaking that, but for whatever reason Mask ended up just severely weakened instead of dead.
Argh! My brains! Too much random incomprehensible lore!