Drop the item to be duplicated, then save the game. When you get back on, there will be 2 of the item. Useful if you want lots of miruvor

I can't remember too well how this cheat works, but as you know Moria is a very tough place so you need health potions.

When I accidentally dropped a health potion with lots of pipeweed I quickly picked the health potion, but there was another, so I picked it up so this way I made a health potion spawning node it works with other items too (I made lots of good swords!)

It's very useful if you need 2 items, but have only 1 and can't find the other (BTW I did it on a switch maybe that has something to do with it?).