No, really... where are my Masteria quests?

You can use NLC scrolls on the Purple Plains maps, just not the two Purplewood maps or at Amos's training ground. I'd be willing to be that if you died it would send you back to Amoria now, though, and before it would not do that; only respawn you right back at the purplewood map, in the middle of the monsters, with 50 HP. >_>

oh... That must be it. I tested it again on the first map, and it worked. And since I was at NLC, I'm lazy enough to not go back for the rest :p