I decided to see what I could do in 10 minutes (Blender).
I managed to make a halberd, a double-bladed axe, a claymore, a broadsword, a longsword, a shortsword, a mace, and a dagger.
When I was making a spear, my timer hit 9 minutes, so I just duplicated the weapons I already had, deleted the spear, and set them up in my last minute.
But hey, at least I managed to keep the weapons low-poly.
Here are a couple screenshots:
All weapons:
Swords:
The polygons for the swords are somewhere around 200 polygons each, axe and halberd are also around 200 each, and the mace is ridiculous because of the head.