Unmaykr

The Unmaykr is a mysterious secretive weapon revealed to be a feature of Doom Eternal in the press event. Found in a central location of the Fortress of Doom, the Doom Slayer's space station, the Unmaykr requires all six of the Empyrean Keys to be found before it can be unlocked. Each Empyrean Key is earned by completing one of the six Slayer Gate challenges dispersed through the game's levels.

The name of the Unmaykr is simultaneously a reference to the Maykrs and to the Unmaker, the secret weapon from Doom 64 which was originally given this name by the Doom community via analogy with a similar concept in Tom Hall's Doom Bible. In addition, the weapon's appearance is similar to its forerunner, with a red glowing core inside its center. Its method of being unlocked via finding key artifacts is also reminiscent of the Unmaker's reliance on the Demon Keys.

Nothing is yet known about the weapon's functionality or power.

Pre-release
The Unmaykr has been confused with the Crucible blade due to statements by press that the weapons are one and the same, but analysis of footage seems to indicate that the weapons bear entirely distinct designs.