I took 'up' as possibly doing double duty i.e. to "tool up" is to "arm" yourself (as in all good cop movies). If not, I agree that 'tool' and 'arm' are weak as synonyms.
rockb @32
Yes, I had - as I said earlier, she features in "Pictures at an exhibition" by Mussorsgky, and also in the Orson Scott Card novel I mentioned.
Yes, I've heard of her, too! although I'm not doing the crossword and had to scroll down to see what you were talking about!
She is the witch in Hartmann's paintings.