Yar, well it's not really all your fault and you are SO close to the end... Hate to see you lot come up short, so time to deploy some Dragonlance-esque story advancement techniques.
Stupid work getting in the way of my posting... Good thing I don't like hiking. Maybe it's time for that Beholder swarm to arrive. 'Think it's the DM's turn' he says! As if I don't know... What CR is Orcus?