Hmm
Well, i dunno why the DM chose to put 2k xp on the scroll.
My first thought was "true seeing" when i heard about the scroll, but then the group shouted "shield". For my own luck i am (again, some may remember the thread with the DM ruling keen weapons unmagical...i am still glad i didn't have to stand that ruling - still giggle when thinking about it...) NO member of the group and NOT the DM...hehe. I would have thought about sanctuary. But then there is this oh so small list in the PHB and since they are allowed nothing except the core rulebooks it might just be that list of choices.
So, Tongues, like was said before, might be the best choice.
Dougal