The way they spell it out, fighting, killing Seelie ... which, by the way? Not all that heroic. [Jason's gotta defend his unheroic status. He can't help it.] Well, anyway, it's supposed to give our lovely monarchs the strength to help with that. And if they get strength, we get strength, and we all take care of it.

It's the circle of life. Just with more death and destruction and less lions on plateaus.