What if Merlin went dark?

what if Merlin went dark? this is a story of what I think would happen if Merlins mother was accused of sorcery and executed by Uther, merlin having to watched all of this, finally snapped, he turned evil, casting all of his rage and power into his attacks. And believe me, no one was more shocked by this then Arthur. But what will Arthur do? Will he be able to save merlin from himself? And will Merlin's rage and hatred change the way he feels about Arthur....

this is my first story, please don't judge me too harshly I'm not the best writer.