Here's where I started off.
This is my helmet highpoly:
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Inspired by this concept, which I loved. I switched up proportions, weighting, made it chunkier, went further into the skull theme with the skull-plate welds showing, and other stuff to differentiate it.
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Here is the blade, some quick stetches but no real concept on this one I just freestyled in zbrush based on the having the skull in there and bringing the teeth over.
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Crits and comments appreciated.
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Here are the low poly versions with textures, these shots are in Marmoset, now I need to get them loaded into the game for some proper screenshots.