With his new link to Hell itself, Keith saw its structural instabilities within the framework of the Realm itself, as caused by the fighting over its control. He realized that while he was holding it together, if something was not done, it would definitely fall apart. So, Keith did something not at all insane and obviously completely rational.
He changed the plane itself to Chaos.
You see, Chaos was very much known for its unpredictability. Paradoxically, that was the only stable thing most people would probably know it for. Oh, most certainly you could direct Chaos, have it work towards your ends, especially if you're a creation OF Chaos itself...But ultimately how it does what it does is quite random. And because of this random aspect, as Keith changed more and more of Hell into Chaos, it grew both more and less stable. Some areas breaking under the stress of so many laying a claim became instead stronger the more stress was put there, other places the stress immediately disappeared as though it'd never been there. As well, some areas broke and cracked as the Chaos infusing the space itself increased the stress...And then there were areas where the stress(and other factors) caused simply random effects, such as making flowers with antlers for petles sprout or turning a hill into some sort of alien duck.
This all was not the only purpose of Keith's actions though. With more of Hell being made into Chaos, he had more and more control over it. He took the areas that were breaking apart, and focused the Chaos into mending them back together, and into relieving the strain and stress the dimension was going through. Hell itself was slowing raveling back together, becoming instabily stable from the influence of Chaos itself.
And Keith's own power, as he did all of this, was beginning to rise further, and further. Something in the back of his mind nagged at him about this...It was unsettling. He almost felt...Afraid of this new infusion of power. Like it might...Change him. Or...More like...Take him over?