Hi Doc Mysterio, The compendium is untouchable. When you put a goblin, say, in your game, it creates a local copy for that game only. Here's the tricky part, if you modify that goblin that becomes "goblin" for your game. The next time you drag a standard compendium goblin into your game it looks at your game and checks to see if you already have a "goblin". If you do, it delivers your modified goblin to the tabletop, even though you dragged from them compendium. This is to protect you from overwriting any house modifications. If for some reason you ever want that compendium goblin back in it's official form, just rename your modified goblin to something else, like "Goblin Archer". Without an existing creature named "goblin" you will once again drag in the Compendium original version. Finally, whatever you do in one game has no effect on your other games. Each game is its own playground, and modifications to a creature are tied to the game, not your account.