First version was... cheap and flat. I attempted to create a metal look for the logo, to add that edginess factor, but all I did was add a fancy texture on the original logo.
Then I did the "The Last" Logo (before I changed the project's name to "The Metal Age"), I decided that Instead of super detailed fancy metal look, I will take a more simplistic route. While the logo looked much, much better. I still wasn't fully sold onto it. It still felt like a cheap retrace and didn't sell the theme for me.
Finally, after few different attempts, dragon skull references and looking up some Artbooks, I came up with the design, that I was happy with. The final MK: The Metal Age look. A design version I could even call my own.
Simple enough, looks amazing in 3D environment (almost like an archeological find) and represents exactly what I have in mind.