Sculpted by: Arlen Pelletier
Release: 2020
Edition: Legacy
Used material(s): Cast in silver and copper-plated solid metal
One of: Unlimited

Signed: No

Issued in Ghost Door box
Buy it here Skelton Crew Studios

First appearance: In Pale Battalions Go #1
Use:
Can change the outward appearance of the user’s age
Door:
Tempus Fugit clock


More information:
(possible spoilers)

In the spring of 1915, John Locke used the Tempus Fugit Key to change his age to 25 years old so that he could participate in World War I.
In 1988, Rendell Locke used the Tempus Fugit Key in the play ‘The Tempest’ to appear as Prospero.

Uses:

“Want to be a grown-up? There’s one (door) that will turn you into an old person when you walk through it.”
– Lady in the Well to Bode

 

The key, when inserted into its lock, can turn change the outward physical appearance of the user’s age based on how much the key is turned, allowing them to make themselves as old or as young as they want, physically.

Source: Locke & Key fandom wiki