The main character has (had? she might have lost them, it is unclear) super powers from being part of an ancient bloodline of warriors. The show briefly Just Hints at this, with characters remarking on how some of her feats are impossible, but it quickly becomes clear. Season one's larger story deals with the bloodlines of warriors and their counterparts, the guardians, and a quest to retreive magic weapons.
In season two, the leads have to stop an evil buisness man from getting possession of the magic bell that caused the 1906 SF earthquake so he can't repeat it. They go to an alternate reality where dead warriors and guardians still exist and fight the evil progentior of both lines.