Here is what you know from Dr. Savarre:
"The land of Souraigne is a vast, festering swamp with many secrets. Most civilized folk live outside the swamp, but there are some forsaken communities within it. It was within one of those communities that the skull was discovered. It was promptly seized by a necromancer known as Monerre. Many learned men with whom I correspond were interested in this item, and disappointed to see where it now resides. Monerre has taken residence in a necropolis on a island within that swamp where, presumably, he studies the relic's power. If this Gilbraith is nearly in possession of the skull, then he must have traveled to Souraigne himself."
You believe, based on Tiffana's visions (which haven't led you wrong so far) that Gilbraith is seeking out the artifacts related to the Grey Gates on Tetslin's behalf. The vision was that Gilbraith was on the trail of this one in particular. You were hoping to beat him to it and take possession of the Skull by whatever means necessary to keep it out of Tetslin's hands, since whatever he wants with it cannot be good.
That's fine, the holidays combined with the terrible weather in the US. Thanks for the information, I couldn't find it.
So everyone, sounds like we need to find out what we can about Monerre and then storm the Necropolis - and wrest the skull from Monerre's hands. Especially since he'd be unlikely to sell it to us, especially if we are in his new powerbase. (We can discuss this in IC)