Release: 2024
Edition: Legacy
Used material(s): Cast in antique gold-plated solid metal
One of: Unlimited

Signed: No

Issued in Ghost Door box
Buy it here Skelton Crew Studios

First appearance: Hell & Gone #2
Use:Makes a sword so sharp that it can cut through anything
Door: Sword hilt

More information:
(possible spoilers)

History

In 1927, Mary Locke retrieved the Sword Key from the Harlequin Wardrobe and loaned it and its respective sword to Fiddler’s Green to use as a weapon to help her battle for her brother’s soul. In Hell, he activated the sword and used it to slice through Hacker’s damned soul as well as his demonic horse. Once the battle had concluded, Fiddler’s Green returned it to Mary.

Its sword was briefly handled by Bode Locke when he moved into Keyhouse in 2011. However, he was distracted by the Ghost Key and quickly forgot about it.

Non-canon history

In the “Only Bad” Alternate Ending, Bode, instead of noticing the Ghost Key, finds the Sword Key, inserts it into the handle and turns it. He then accidentally falls, and the sword slices Bode clean in half, killing him. His bisected body is later discovered by his horrified family.

Uses

“There’s a Key for the handle. If we get into a spot, give the hilt a twist. It’ll cut through anything. An iron block, a horse, a demon, a human soul.”
–Mary Locke.

When the false pommel of the sword is removed and the Key is inserted into the handle and twisted in, it renders the sword sharp enough to cut through anything with one slice. The sword can even cut through the comic’s fourth wall and cut the dialogue balloons. The Key now acts as the sword’s pommel.G9

Door

The Hilt of one of the two swords hanging above the fireplace mantel in the Winter Study of Keyhouse Manor. The fake pommel has to be removed first before the Sword Key can be inserted into the hilt.

 

Source: Locke & Key wiki