Hi
When facing the rats on hills they disappear for a moment and then they reappear.
I've never encountered it. Could you describe in more detail where you encountered it?
Stacking works fine for money on the side and ingredients but not for food this could be an enhancement
Food never really added up in Grimrock. I'll give it some thought. Also, gems don't stack in the game, but that's because of a limitation in the enchanting mechanics.
When you go to Druid Village a lot happens. It changes you skill from Wizard to Druid
It's okay! You just started playing a different character. Of course, this mechanic didn't exist in vanilla or any other mod (as far as I know).