I didn't think about Darkvision. Well Xavier and Tylara can scout with their familiars. Go ahead and start that. Manny might even be able to ride on Tylara's eagle, the sizes are right. We need to look for total numbers, number of guards, anything similar to a shaman, and the general layout of the area.
If we buff up Max he could be doing 3d6+4 damage minimum after Enlarge Person and Shillelagh, he can even flurry with it. Someone would have to scribe Enlarge Person into their spellbook, which Manny has a scroll of. Whoever scribes it can create a new scroll to replace it. If we can get Alter Self (maybe from Crus) then we can change into something with up to +6 Natural Armor. That plus Mage Armor and Shield would give Max an AC of 10 +6 NA +4 Armor +4 Shield +2 Monk = 26 AC. We could all do it together in one round and he would kick butt. It would only work if there is a courtyard to fight in though.
Inside we could use Web to good effect. We use Caltrops to slow them down and get them to bunch up for the Web. A torch would do 2d4 points of damage to those inside. Sleep would help as well. I can memorize Web three times.
The problem with spells like Grease, Color Spray, and Glitterdust is that with the numbers we will be dealing with, we can't take out the disabled foes fast enough before more are on the way.
Maybe Max can scribe Enlarge Person and I can scribe Alter Self. We have the money available and anyone who wants to memorize it can borrow our spellbooks for free.
The low level characters can cast spells like Mage Armor and Sleep which don't require a high caster level.
Any other ideas? I know I'm repeating some of this, but I want to keep it all together.
@Manny: If you don't plan on getting a familiar, you may want to try using the Immediate Magic Alternative Class Feature from the Player's Handbook 2. For Transmutation specialists it gives you a Fly, Swim, or Climb speed equal to your land speed for one round, INT Bonus times per day. Since we've just now started in the heart of the game Leif might still let you change it. Also, go ahead and make some Continual Torches. We need to scout out some and we should probably wait until Crus arrives before setting off.