21. Most unexpected spell that helped you get past the walls of the Fortress of See.
The fireballs were definitely useful as we approached the fortress and confronted the Guardians of the Sacred City, the levitation spells would have been useful to get over the walls but the nega-psychoc barriers prevented almost every form of magic from working. The only spell that did seem to work was that odd little Chance Minutiae spell that Devali concocted a few years ago. We left it running for a few hours just beside the wall, returning to the spot only to find that the thaumivorous nature of the spell actually ate away chunks of the wall, leaving enough opening for us to crawl through the wall and into the fortress.