When Clinton forged the Light Slayer, he found himself in a special state of mind that he had never experienced before then.
Just after suffering the heartbreak of an identity crisis, shunned and rejected by humans, while dealing with that, he still had to fight for his life against the same humans who came after his life.
With his life on the line, he started forging his weapon.
He forged Magedon, Light Slayer in a life and death scenario, a special state of mind where the result of his work had the capacity to decide his life and death.
Clinton was not in quite that unique state at this moment, but compared to that time, his craftsmanship skills already improved by a lot.
Not just that, having accepted his identity as a skeleton already, his conviction when it came to surviving was firmer than ever before.
And since crafting a better, stronger weapon would help in his survival, Clinton approached this new test with a determined mind.