4) "The best of all swords" Snidil
It "never faltered in battle" owned by Odd's companion, Sirnir. That's really all there is to be said about it in the story. It isn't exactly magic, I suppose, but never faltering in battle seems pretty super-power to me.
5) Three Stone Arrows
Gifted to Odd from an old man named Jolf while Odd was living in disguise (dressed in bark) and going by the name of "Barkman." These stone arrows could only be used once, and were meant to defeat an enemy which Gusir's Gift couldn't. Odd uses them, and they disappear after taking out his enemy.
From the Romance of King Gautrek:
6) Starkad's Magic Spear
It appears to everyone else only to be reed, anad Starkad uses it to kill King Vikar in sacrifice to Odin, when Vikar would have made mockery of hanging himself to the god. When Starkad pokes Vikar in the side with it, it turns back into a spear. Magic!
From the Romance of Halfdan Eysteinsson:
7) Halfdan's Magic Sword
Gifted to him by an elderly couple in the wood who nursed him back to health, the sword "seemed to drip venom from its edges." And it ensured victory to whoever held it -- at least if they "handled it properly" it would always find its mark.
8) A Necklace of Precious Stones
Also a gift from the elderly couple -- the necklace protects Halfdan from harm, granting a certain level of invulnerability as long as the stones are whole. It's a good thing, too because half of Halfdan's enemies seem to shapeshift into dragons at the drop of a hat.
9) The sword Horn-Hilt
Owned by a viking named Val, "inlaid with gold, and its stroke never failed."
We still have four Romances to go!
Related: Magical Objects, Arrow-Odd Edition