The Sword of Light is a magical weapon presumably created by the Ancient Walkers to counter dark magic.
The weapon is very similar in appearance to the Sword of Acorns. Initially, it appeared crafted with a gold hand-guard as well as the handle. When in possession by Elias Acorn and wielded by Sonic the Hedgehog against Ixis Naugus, the weapon appeared with a wooden or oak handle instead of a gold one, with an ornamental gold acorn at the base of the handle. The blade comes with a custom-made gold and oak scabbard with the a rounded emblem containing the Acorn coat-of-arms.
Its first known wielder was Sir Connery, a Paladin of the Ancient Walkers and knight of the Kingdom of Acorn. Having been called away from his service to Maximillian Acorn and given the Sword of Light, Connery wielded it in the quest the Walkers gave him: to hunt down and destroy all wielders of dark magic. The Sword's energies made the otherwise ordinary Connery a match for the likes of such villainous magicians as Black Death and the Enchantress, whom he slew with the Sword after defeating them with the aid of Knuckles the Echidna. Mathias Poe and Damocles the Elder would later fall to the Sword of Light as well. (StH: #45, #47)
It was later wielded against the Destructix as they attempted to steal Mammoth Mogul's Chaos Emerald from Merlin Prower, an ally of Connery's and successor to the Ancient Walkers. Connery then employed it one last time, drawing upon its ultimate attack to destroy the Sword and Crown of Acorns, thus wiping out the magic of the corrupted Source of All-though at the cost of his life as it drained his life force to unleash a devastating blast. Afterwards, the Sword of Light was claimed by King Elias Acorn as a royal artifact of his house, in memory of Connery's sacrifice and to replace the objects destroyed in battle with Mogul. (StH: #162, #163, #164)