We played the next game in the campaign today. The heroes tracked the vampire to his lair. The undead creature was protected by his army of skeletons and a wight king as well as a horde of rats.
The Paladin and Dwarf Lord broke off to take on the wight and some skellies, while one of the Slayers dove into the rat swarms.
The vampire attacked the other heroes. It was a bloody fight, but they defeated him. However, he turned to mist a drifted back into the castle.
With the vampire gone, the Slayers could double-team the rats.
In the end, the heroes know the only way to defeat the Vampire for good would be to go into the castle and find his tomb.