We're doing the Bastion right now! We just got to it this past Saturday, but we haven't entered it yet. I must say, though, that a 21st level rogue, with a ring of blinking and a +5 short sword (holy, bane vs. evil outsiders) comes in real handy when fighting demons. I roll 14d6 every time I hit one of these guys. Get me hasted and spring attacking, and I can usually take out a Balor in a couple of rounds.
So what does the DM do? Gives the Balors character levels, really nifty feats, and some absolutely evil magic items.
I posted a question in the rules forum regarding the way the Epic Feat Lingering Damage works, particularly for a character with multiple sneak attacks in a round. If anyone else has any thoughts on how this would work, please visit the thread here:
Lingering Damage Thread on the Rules Forum
We worked this module into an ongoing Forgotten Realms campaign, so we have fought a number of other demons not included in this module, cleared out a Cult of the Dragon stronghold (including killing a Dracolich), and made a couple of forays into Hellgate Keep in addition to tracking down and killing Ashardalon.
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Did anyone else run into this problem? We went to speak to Deseus (or however it's spelled) and he's being guarded by a solar and a planetar (or some other celetial beings like that.) When you meet him, you find out that not only is he not evil, he was once rather noble. Our DM told us that the module said explicitly that he would not part with the section of the soul totem voluntarily, and we needed it to get into the Bastion.
However, we have two Paladins in our party, and one fighter who spoke with Corellon Latherian while her fighter was temporarily dead, and came back Lawful Good bearing Corellon's mark on her breast. We were not about to kill this guy, and he was not going to give the soul totem to us. We had no problem running around chopping demons to bits, but we couldn't bring ourselves to raise a hand against this sad ex-deity.
Our DM got out of it by allowing everyone to make diplomacy checks, and if we could make a total combined score of 150 between the five of us, we could convince him to give it up.
Good thing we have a party full of charismatic, diplomatic people.