So here's the pitch...
The Gate has gone partially active, and Xoriat creatures are making their way through, along with a powerful field of Xoriat Madness. The players are called back to the ruins, where the dig teams have finally resolved their differences...by going mad.
The players delve into the ruins once more, seeking the means to seal the portal once and for all, before someone manages to open it completely, but things are complicated by the influence of Xoriat. While under its effects, what was ruined appears whole, Threnal in all its Xoriat-worshipping glory!
After delving through both the ruined and 'restored' areas of Threnal, the heroes gather the needed items and instructions to destroy the gate, but one of Xoriat's greatest champions has made it through, and will do all in its power to stop them from achieving their goal.
(NO ESCORT MISSIONS!!!)