AHA! a solution to the mason's problem came into your head while looking at Bob. You could change out his stuff for builder equipment, or make a BuilderBot. eh, you've got metal to spare. But first, a new sword. its almost night after all, and that sudden adding of a guard was a bit odd. So you make a second sword, this time not getting knocked out in the process, which lets you sharpen the edge quite a bit more before it settles. You then uncork the bottle and dip the Crysteel sword in it. it knocks you across the room (it was a higher level spell) but is absorbed by the Crysteel.
With new sword in hand, you go outside (after having dropped the Crysteel chunk out the window and reinforcing the crack in the floor) and start making the parts for a large Builder robot. its quite hard to do with your quite limited knowledge of mecha, but hopefully it'll be able to work.
...
its done finally. It looks like a giant hollow box with assorted equipment attached to it and there are supports everywhere, and the masons will probably laugh at the ridiculous thing.
Its a huge 'bot for Rank 2 (as tall as the first tower floor), so random.org will decide whether it works. if it does, +1 Rank in mechamancy and technologic. if it doesn't, you'll have a pile of crysteel junk and a goodly amount of mecha exp.
It used 10 crysteel, 5 left.
Edit: So, what do you want to build?