Interesting topic, Brynn. Me, they would have to be:
Celtic/Arthurian:
- Excalibur. A weapon with greater power within its scabbard, particularly to keep its wielder from shedding/losing blood.
Sumerian:
- The plant of eternal youth. It may have possibly made humans never age or die if it wasn't eaten by a snake. Fortunately, Gilgamesh decided building and stabilizing the city of Uruk was enough of an accomplishment.
Greek/Roman/Olympian:
- The winged sandals of Hermes/Mercury. Could save me money for gasoline
... and maybe get me in trouble with the Federal Aviation Administration.
- The Nemean Lion pelt of Heracles/Hercules. Practically invlunerable to any weapon.
- Hades'/Pluto's helmet of invisibility. Always loved the idea of vanishing in plain sight.
- Medusa's head. Turning things that annoy you to stone, anyone?
Norse:
- Thor's Hammer, Miolnir (sp?). From what I read, that thing could just about pound giant skulls as easily as if it were fire-hardened clay! Of course, the god of thunder needed his gloves and belt to wield the thing safely, so there was a drawback.
- Odin's spear Gugnir. The All-Father practically couldn't miss with it.
That's all I can really think of.