All of these are awesome ideas guys. The BBEG already made an appearance of course, and I just made something vague about him holding everyone in place so they couldn't even move. Similar to Leitner's Mass Hold idea. But since my PC's are considerably higher levels since BBEG's first appearance I was going to at least let my PC's have a little more of a fighting chance.
lemeres, I like the sacrifice idea. Our last session everyone wanted to play with the Deck of Many Things and the one tank got thrown in jail. I was thinking BBEG could also make an appearance there as they're trying to make their escape.
Val'bryn2, knowing my friends, something like that would just get them excited and try to fight the REAL BBEG immediately. Lol.