Shin Okada, I sympathize with your plight. I have dragged my party through the entire adventure path, and this weekend we will put the final nails in Imperagon's coffin (Lord of the Iron Fortress). The Bastion has been bothering me for exactly the CR29 reason.
I'm going to send my PCs through a slightly beefier Harrowing (Monte Cook's Dungeon adventure from years ago) just to inflate their levels a little bit. I want to be sure that they're 20th (they are five 16th-level PCs now) before their audience with Ashardalon. I've managed to kill two of them per adventure. Considering the consequences of death in the Bastion, I don't want any whining when the inevitable catches up with them.
I thought that the feeling of the greater ENWorld community was that
Silence is too powerful as written and it's really subject to Will saves and spell resistance and all that happy crap. Here, you guys are saying that it's a legitimate defense against
Blasphemy. So which is it?
I have considered tweaking Ashy to the hilt. There was recently an article on the WotC site about changing the fiendish and half-fiend templates, but I can't find it. At any rate, I am going to make him absolutely insane with SLAs pulled from
Spell Compendium and the other books. As long as
Blasphemy is stupidly broken, I'll just change it.
I haven't looked at his other powers. I imagine Ashy will be the second-to-last NPC I convert, and it will take a week to do. And then there's the issue of the symbiont, heh.
EDIT: aha. here:
http://www.enworld.org/showthread.php?t=150446 So without Patryn in this thread,
Silence appears to work as written. OK, yay. I like the spell that way. All it really does is force you to move (unless you are actually a target).