The Darkness SA: Place an Evil Character from hand face down here. If an opponent begins a rescue attempt and chooses a blocker (or is unblocked), you may reveal this evil character. Blocking player may add it to the battle. Otherwise return it face down.
1. The moment a player places this fortress down on their territory , do they have to place an EC from hand right away on it or can they place an EC on it anytime they want?
2. Does the SA allow you to add the EC on it to battle anytime you want , even before battle resolution begins? (similar to Madness , Gates . Unknown nation)
3. What does the "chooses a blocker" part mean? does it mean you can add the EC from the fortress instead of a ctb hero picking a certain EC to block??