How does Mists of Oblivion destroy invaders, if it only does one damage to each Town/City?
How does Mists of Oblivion destroy invaders, if it only does one damage to each Town/City?
Usually, only if the Invaders are already damaged by some other effect, or if you hit the threshold.
The instruction "1 Fear per Town/City this Power destroys" means that you generate some extra Fear if the power happens to destroy things. It's up to you to arrange how this happens, using the rest of the card.