Crusade in the Dead Lands: Pt. XI

Crusade in the Dead Lands Pt. XI
Horror Fantasy Adventures: 8-10th level

The party has "freed" the undead king Kresimir from his enthrallment under Dominic. They destroyed the treacherous vampire children of the undead king; on prince Radclav they found a magical key that supposedly could give the party entrance into parts of the Shadow Realm where prince Domicic often dwells.

The vampire prince Dominic's earthly domain is continually shrinking as the party consecrates each castle and keep and old church they retake. Also, as they spread their faith 1000+ people are freed and many other flee the vampire's minions and join the party and their faithful reconquest. The once Godless land is being reconsecrated spiritually as well. The vampire is bound to his land, and he is slowing becoming a prisoner just as he has imprisoned those who serve him now. Those who feared are now becoming defiant and ready to rebel.
The party now must decide whether to investigate this key they found or to continue on freeing the earthly realm. Going into part of the underworld or Hell may also be a trap that the vampire wants them to fall into. Afterall the key was offered up by the vampire's minions even before they were killed.

This is a Home-brew campaign using Pathfinder/D&D basic rules.