Without spoiling as best as I can:
The group took the shorter way to the climactic battle with the Enchanter.
2 Warriors entered the room and were promptly vapourised by a rather excellent magic missile.
The group's elf enters, uses 19 points of spellburn...gets a total spellcheck of 40!
zZzZz and that was that. 1500ft of super amazing 100 year sleep spell.
I thought it unfair to make up some excuse, so I just said fair enough, it works.
Only the 'special' thing below was immune...and because of the range, I ruled that it affected the whole place.
Gobsmacked. Still, we had a lot of fun.
My players are really digging DCC and the open ended nature of things that can happen.
I am not saying one way of gaming is better than another but I do enjoy the sense of excitement each time we play as even the DM has utterly no idea what is coming.