Have you got the pre-requisites to learn blackout? Or any of the other arcana? Not only do you need rush to have the correct invocation/evocation, but also every other member of the union to be able to cast one.
That would be rejuvenating water, and it is arcana.
Here is a guide. GameSpot Forums - The Last Remnant - Complete Arcana Guide V.2.0
Afran, which leaders to you normally use in your teams?