Underpall Cave is a lair of undead. It is located along the Orange Road northeast of Chorrol. The lair starts out as a cave but turns into a large fort. The necromancer in charge can be found wandering the halls and conducting experiments in the fort, which is on the shore of a giant underground lake. It is also the site of the tomb of Lord Berich Vlindrel in the official Knights of the Nine plug-in, in which the Hero faces his wraith.