@namad: Not the case. I think it's the dialogue option "Look, Rind, If I don't have a scroll, would you write one for me?" at which point he scans your spellbook for wanderer scrolls he can't make yet.

@tiberiu: I wouldn't know. I always have more than 50 crystals on me.

You have to give him one scroll so that he can learn it. Once he learned how to write a particular scroll, you can ask him to write one for you, which requires 5 crystals, and after a few battles it shows up in your spellbook without notification. He can only write one scroll at a time, and the procedure is repeatable (he only needs to learn it once).

At least, that's the way it worked for me, seemed perfectly fine except for the missing notifications (5 crystals taken, and scroll finished).

Seems like we have it figured out. I'm going to add lack of notification to the bugs thread, I would not have wasted 5 crystals on gift of stone if I'd known that, I was saving up for Crystal Collector.