[3.5] "Look, whatever you're thinking, do me a favor; don't let go."

[GrayGriffin]

Heavy Weapons are on page 179 of 'Magic of Faerun'. They require the Exotic Weapon Proficiency feat to wield, even if the weapon is usually Simple or Martial.

For example, to wield a Gold Longsword, you need Exotic Weapon Proficiency (Heavy Longsword). Weirdly, you don't need to be proficient in the weapon's normal version. So it's possible to be proficient with Longswords made out of Gold or Platinum, but not ones made of iron or steel. Very odd. Not how I would've done it, but those are the official rules on the matter.

The only differences between a Heavy Weapon and a normal version of the weapon are already noted in The Glorious King of Metals (+1 size category damage, x2 weight, requires special proficiency).

I dunno. Depending on weight difference, a much lighter sword could be just as unwieldy to handle as a much heavier sword.