Quote Originally Posted by DerTollUdo
Piercing is unuseable, fluff wise: the air is just to thick to stab.
Erm.....this is entirely the wrong way around. Piercing would work better than slashing or bludgeoning in a thick atmosphere/environment. It's all about surface areas and resistance, there's a reason harpoons are still used for underwater weaponry. Bludgeoning shouldn't work at all. Slashing should take penalties but still work a little. Piercing shouldn't take much (if any) penalty at all.