Another possible connection... In Small Favor, Luccio states that there was a Dark Ley Line, under Sue's museum. I got the impression they were separate, but if not, it might be a bad thing.
Since, didn't the Gatekeeper warn about drawing power from DR's LL? Even if somewhat diluted, from distance from the source, I'd think it might have some of those changing effects the Gatekeeper warned about.