This fight requires little strategy but is still quite difficult, particularly in heroic. The primary aspect of this fight is that he hits the tank VERY hard. His normal hits are for ~3k-5k and Dark Slash hits the tank for 50% of their health. Occasionally, King Ymiron will cast Bane which causes shadow damage when he is attacked. All DPS need to stop attacking when Bane is up. It needs to be dispelled or spell stolen immediately so dps can resume. He will also occasionally cast Fetid Rot on a random party member, which needs to be removed as quickly as possible.