What's your sample size? It's probably just random luck of the draw.

I tried 10 times in the dungeons and 10 times in the campain. I got shards potions and sometimes characters in the campain but no weapon. The first time I thought something was wrong was when I used all my multi battle on the spider during the night. We are talking 45 multibattles. And no artifacts. 

So no. Sadly I don't think it's luck...

It work when I do it manually but not with the multibattle...

When you say "no artifacts" - are you sure you don't have autosell selected? Maybe the ones you would be getting are just being sold because of your filters?

Omg you are right!!!!!

Sorry, I'm such an idiot xD thank you so much.

I didn't even know you could auto sell weapons! I think I clicked on it by mistake.

Problem solved xD

No worries. We all make that mistake from time to time :) Definitely is a real pain when you have "sell everything" selected for campaign, and forget to disable it when switching to dungeon.

So true.

But I am really happy this is solved.

Thanks again for your help :)