Quote Originally Posted by MFauli
Btw how does spell-learning even work? Do they receive "grimoires" aka spells on paper, activate them like in a video game, and they grimoire vanishes and they got the spell? Otherwise, why not just teach others the spell?
You read it and remember it.

You don't go around teaching it because you might like the exclusivity and you're also not a charity.

Spells and mages used to be common, and there's folk magic etc where people just locally develop their own thing. It's like regional recipes for foods. Logically, one as useful as laundry shouldn't have become obscure of forgotten though, unless mages never do their own laundry.

I'm going to interpret it as just being a gag / contrast.

It would be cool to see Lernen fight. Looks like he's a powerhouse too to break Frieren's barrier. Weird how he'd just request a duel so he can kill her and accomplish something. Frieren's got nothing to gain from it and he should have realised that.