Ulfrpsion

In response to the other half of your mod question: spawning npcs and items is normally handled by script, list, or direct placement, depending on what you want to do. If its random encounters, they are spawned from lists of scaling creatures placed into a spawn marker (press m in the ck, they look like a big green m). You can adjust the list or what marker is in the world to change those spawns. If you want to change loot, there are loot lists of items which are randomly pulled from that you cam adjust. They are normally for scaled loot in chests and such. Otherwise, items are placed n the worldspace directly. Script-based spawning and such is normally handled by an area or activation trigger with an attached script that pushes out monster spawning, and item spawning in a sequence of response events.