This boss appears on Archdragon Peak, after ringing the large bell. The King is an optional boss, and does not need to be beaten to complete the game.
The Storm Drake is protected all over it’s body, except the head. This is the one location where you can hit it for full damage. Physical will deal normal damage, and the Drake doesn’t seem overly weak to anything aside from Miracles, which always deal more damage to Dragon based enemies.
The Nameless King is attuned with Lightning, so he is very resistant to it. However he doesn’t have a very high physical defence, and is susceptible to Pyromancy and Dark spells.
The first part of this fight is against his dragon as the King rides him. As with all large bosses, your safest spot is beneath him. Stand under his neck, and anytime he lowers his head, hit it. You can also attack the feet, but you do less damage to them, his head and neck are the weak points.
Being beneath the dragon will make it impossible for him to hit you, so your only concern is the King who rides him. He will try to hit you with lightning or his weapon when you stand under his ally. Always keep an eye on him, and use audio cues to tell if he is about to attack. Of course, wearing heavily resistant lightning gear will go a long way to mitigating the damage the Nameless King can do.
During phase two, the King powers up his weapon by absorbing the energy of his dead dragon. It now becomes a 1 vs 1 fight, so treat it as such. If you are used to dodging, get in close and roll circles around him. If shields are more your style, make sure to have equipped something that offers both high Physical and Lightning resistance.
Although his attacks aren’t very spectacular, mostly swings, lunges and stabs, he hits incredibly hard. Even in heavy armor, it will likely do nearly half your health with each swing. Always keep your health topped up, even if you don’t think you need it.
One thing that will work in your favor during this fight is the boss’ ability to be stunned. After receiving so much damage, he stumbles and kneels down, taking a few seconds to recover. If you can, run in front of him and attack to get a very powerful Riposte attack off (The same as a Visceral attack from Bloodborne). This will deal tons of damage to him, helping to chip away at his rather monstrous amount of HP.
As a mage, phase one of this fight should be executed the same was as described above. Stand beneath the dragon to cast your spells, as this is the safest location. Where things change will be during the next phase.
During Phase Two, as a mage you need to stay away from him at all costs. His attacks are devastating, and getting in close will mean death. Keeping him at range will cause him to use his spells with more frequency though, so make sure to only cast your only spells after baiting out one of his own. Dodge his incoming blast, then counter with one of your own.
This fight for ranged character will require a great deal of patience, and a powerful array of magic. If you find yourself struggling, consider coming back when stronger spells and more FP are available to you.
For killing this boss, you receive: