Red Orb (Sphere of Prohibition)

In my opinion, the game is more interesting with the Orb. It doesn't appear in every game, and I often run out of them by week 2 or 3. But in the late game, I usually have 2-3 good heroes, and I can always choose which one to send to the Fortress. If you're focusing on just one hero, you need to work on your gameplay.