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Summary
Source: Volume 22 (BookWalker)

Legendary Weapons
The strongest class of weapons in ALfheim Online—as Unique items, supposedly only one of each exists on the server at a time. Some known legendary weapons include the Holy Sword Excalibur; the Demon Blade Gram; the Spirit Katana Kagutsuchi; the Bow of Light Shekinah; and the Hammer of Lightning Mjölnir.

Crest of Yggdrasil
A legendary weapon made from the highest branch of the World Tree, which Kirito snapped off and took with him. It looks like a narrow branch that measures over four feet long, but it is classified as a Two-Handed Staff and commands incredibly high stats worthy of a Unique. In the story "Calibur" from Volume 8 of Sword Art Online and later on in this volume, Asuna uses it as her main weapon to aid in her role as a healer.