The arm sword is so epic. XD Blue one is my favorite, but I'd like to see more warrior type weapons that aren't just swords (even though I like swords the most).
Maybe it would affect things too, for example, Axes would have high critical rate, but lower accuracy rate whereas spears would have lower attack, but more accuracy, or something like that. Certain units could be weaker to certain types too for example, a spear or rapier, or certain swords would be good against armored units (pointy and can pierce gaps in armor), whereas axes and blade-like swords would be good on fleshy monsters! (better for hacking/slashing and what not)
Although. I'm sure you've put more thought into this than I have and probably done something similar, thanks for the frequent updates.
The dragon arm seems as though it would get all slimey and start decaying. The Sword looks like glass. Finally, The hammer is a wind up toy. Just narrowing down the choices to the basics so have fun choosing. xD