Everyone in Paegeia knows that only one Rubicon dragon lives at a time.
If more than one, they will destroy Paegeia and eventually the rest of the world as they crave that constant power for dominance.
Blake Leaf is this era's Rubicon, and is destined for grate things if his darkness can be won.
Darkbeam Part 1 follows the story of the Rubicon and how he tries to keep his beast, the darkness, at bay.