I was trying to make stuff on offline mode. However i couldn't save what i made. But anyway i am curious that is there a way (or will there be a way) to create own NPCs and own quests, stories and but attackable monsters to the areas and so on. For NPCs i saw an "NPC Edit" menu in offline mode where i could create new NPC or load one. However everytime i tried to create new one or load the game crashed to desktop.

So does anybody know how to make them?

Thanks for the answer!