Okay, lets say the OL played "Hordes of the Things" in round 7 of the game. It's a power card, it goes face up in front of the OL for future use.
It's now round 23 and let's say the OL plays another "Hordes of the Things"...
It's now round 26 and lets say the hero's open a new area...
Does the OL "activate" both power cards? and discard both? or do you discard a power card once it is activated? or does it remain in play? (ie the Overlord could "activate" both Hordes of the Things whenever a hero comes to a new area)
???? help please ????