After you arrive in Hallowed Hollow, you will be greeted by the Zombie TK Baha. He will explain that Hallowed Hollow is the retirement and Exile land for Pandora's Undead. Go on over to the West to find TK. Talk with him to start the next objective: Kill the Pumpkin Kingpin: Jacques O'Lantern. Head to the West and into the Necropolis
Head to the West and on through the next checkpoint. Get there and a lock will appear, barring your way forward. You need to find some Enchanted Skeletons to forge the key.