Grimrock

Is that a feature of all mod campaigns or is that something the modder chose to have in the game? Are there any awesome campaigns that let me start with all my loot?

https://www.youtube.com/watch?v=WWaLxFIVX1s Damn it. I have one I can't use and another one I can use but left it somewhere god knows where. And I'm such a hoarder, I held on to this dagger for many, many floors, then decided to drop it. If only I hadn't wasted 7 points on dodge, I would be able to ...

I read that Master Assassin is supposed to instantly kill with back stabs. I tried it on an , didn't kill it. I was using a sword. So, how exactly does it work?
Does it instakill just some enemies?
Does it need a specific weapon type?