From publisher blurb:
Over a century ago, there was a secret war, and an end to all magic. Now the Century of Silence has passed, and the Thresholds are re-opening, spilling victorian magic, monsters, and mayhem back into a world that thought it had passed them by. Maybe you’re a recently-enlightened mystic, maybe you’ve spent the last hundred years sleeping and waiting for a chance to return. It’s a new dawn for the ancient arts; can you master the Æthers before they master you?
The ExArcana cards provide a wide variety of aether-slinging spells, supernatural races, and eldritch items. These are the tools and the talent you can use to tackle the penny dreadful creatures, oathbreaking magicians, and various other full roaming vapors that mean harm to the world.