Private Message to Barty

[alt_antonin]

Dear one -- please say you are free this weekend for at least a brief period; I am in desperate need of time spent with someone who can remind me that I am, in fact, a capable and competent teacher. (Best not to ask. The idiot children have prompted the day from hell.)

I am having a hideous day, my head is throbbing, and I don't have time to run through a dozen books to find the right reference: do you happen to remember offhand which book has the chapter on adapting magic to compel and bind others' magic? I thought it was Daughtery and Smith, but that's not it.