This is the sequel to Dark Libra.
The chain of events that were caused by the Dark Libra incident have made some very bitter and powerful pony desire Cassius power.
He has created a group called The Faithless, and after what Cassius Nightshade had done they vowed to take what little reminisce of him they could.
News has hit them that Princess Luna as given birth to two foals, the same two foals that were once her guardians.
Six years later and a few failed kidnappings and assassinations, they have found a secret of getting Cassius himself under their control using his own tricks against him. One being his ability to bring out the darkest forms of ponies and have their undying allegiance. This will fuel a sibling rivalry that with bring about the last Alicorn war. The fate of everything Princess Luna hold dear rest in the hooves of her children and a mercenary looking to sever his family ties.