Malleus Key

The Malleus Keys are three magical devices built by the Ruby Vanguard and its allies to achieve the Vanguard's goal of releasing Predathos from Ruidus to allow it to consume the gods of Exandria.

Description
The Malleus Keys are large devices, described visually as "extended" versions of the Veilscatter Scope. Ryn, a specialist in the planes who observed the devices at a distance, said the Keys have "some unique planar projector or tether aspect", but she could not ascertain whether they create tears between the planes, fold the planes together, attempt to pull down and destroy Ruidus, or something else.

Before Campaign 3
By 836 PD, seven years before Campaign 3, the Ruby Vanguard was building the Malleus Keys in the Feywild and the Shadowfell at the point where these planes overlapped with the nexus point in Marquet for the Apogee Solstice in 843 PD. Ludinus was collaborating with Otohan Thull and the Unseelie Court on the project in the Feywild. Ira Wendagoth subsequently left this project and began working against Ludinus and Otohan; Birdie and Oleander Calloway additionally stole the Moontide Crown from this device, delaying progress.

Campaign 3: Bells Hells
In 843 PD, Bells Hells discovered that Ludinus was working with Otohan Thull and the Unseelie Court on work relating to Ruidis through Ira, who left the Unseelie Court project. They learned more details of the Vanguard's work in Marquet, the Feywild, the Shadowfell through members of the Grim Verity and resolved to sabotage at least one of the devices. The group learned the names of the devices, Malleus Keys, after they captured a member of the Ruby Vanguard.

Trivia

 * Malleus is Latin for "hammer".
 * The Malleus Keys have a similar name to the Factorum Malleus, an Aeorian project aiming to kill the gods.