When Sylas left, he basically destroyed the United Alliance of Terranova and then crippled the Africor Continent. The former he had done because they targeted his wife, and the latter he had done because they targeted him.
As though that wasn't bad enough, during the last war to complete the Summoning, the European Emperor had also been killed by one they speculated to be Sylas. Though this wasn't true—the European Emperor had actually died at the hands of others—Sylas would have certainly killed him if he came across him.
The European Emperor was an arrogant, aggressive bastard who thought too highly of himself. Sylas had never personally met him, but he had heard of his words through the grapevine.
Archibald had once asked him not to kill him because Earth needed all the experts they could get. But as far as Sylas was concerned, the only expert Earth needed was himself.
