Catacombs - Room 24

You've entered a great hall decorated with bones and hanging skeletons. A grotesque horde of skeletons and ghouls moves in a parade before disappearing into the portal. When the procession is gone, you see a robed lich presiding over the hall. It holds a macabre grin and speaks in a dry, ancient timbre:

Ah, mortal, welcome. How have you fared in my city of the dead? I am what you adventurers might call a "final boss." Fortunately for you, I am too busy with necromancy and must eradicate a greater threat at present. A cohort of vampires has invaded my oldest mausoleum. Perhaps you can help me deal with them. Exit through the portal to reach the cemetery. The mausoleum is there.