Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods [Editor] How do I add a chest to the game?

So basically, after re-specing I lost two unique spells that I haven't found anywhere else.

How can I add a chest with items into the game?

I tried loading a level and clicked on items, but whem I selected chests, all it did was highlight chests already placed on the map, if that makes sense.

I can't figure out how to place new ones. A guide would be much appreciated