At first, Solam had not intended to spare Azliels. According to his original plan, while Horus was recuperating from his injuries, he needed to step out and stabilize the situation. And how did one stabilize the situation? Given Solam's usual simple and brutal style, naturally by striking back. Solam had always been petty. These four bastards had come to his home, tried to steal his things, and injured his people. How could Solam possibly let it go so easily?
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My ass!
So Solam decided to tear down some homes! The homes of those four assholes. That was how the previous scene had happened. When he reached Flame Lord Azliels, Solam had originally intended to follow the usual procedure: if the man was there, kill him; if he was not, tear down his home and vent a little.
But Flame Lord Azliels had chickened out, and he had said something about how balors ought to pledge allegiance to the Balor King. That made Solam hesitate. Solam truly did not care about a Flame Lord like Azliels. There were probably not a thousand demon lords of that caliber, but at least eight hundred. (The Abyss had many layers, not merely the known 666, and each layer did not necessarily have only one lord. So no one could really say how many lords the Abyss contained.)
But those words did remind Solam of something. He was the Balor King! By all rights, he should have been on the same level as Malcanthet. But when he thought about it carefully, Solam had not been much of a Balor King at all! He only had thirty-odd balors under his command, which did not match the title Balor King in the slightest.
And at the