Ostium
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| Name | Ostium |
| Manufacturer | Men of Letters |
| Powers | Transports demons and monsters |
| Location/Owners | Lawrence, Kansas |
| Episodes | 1.01 Pilot (The Winchesters) 1.03 You're Lost Little Girl 1.07 Reflections |
Six points of infinite light. The order must be right. To capture the darkness and the light.
– N/A, 1.01 Pilot (The Winchesters)
Characteristics
The Ostium is a "monster trap" that was built by the Men of Letters, it is adorned with various runes and powered by dark magic. The box is activated by the tracing of the runes in a precise order, once opened the box can trap demons, monsters and the Akrida.
Originally it was believed the Ostium was capable of killing the Akrida, but was later revealed that the box was designed to transport rather than kill. According to Henry Winchester, the Ostium's power source determines where the portal opens. With the Akrida, a piece rock from their home universe was needed to power the Ostium and send them back.
Episodes
1.01 Pilot (The Winchesters)
1.02 Teach Your Children Well
While under attack by zombies, Lata attempts to use the box against them, but it fails to work for some reason.
1.03 You're Lost Little Girl
The Monster Box is still powerless and the group searches for the partner of the demon that had possessed Ada in the hopes of finding out more information about it.
1.06 Art of Dying
Lata mentions that despite all of their research, the Monster Club still can't get the box to work again.
1.07 Reflections
With the help of her son, Ada finds more information about the box in an abandoned Men of Letters office in Ann Arbor, Michigan. The notes prove to have been written by Henry Winchester and reveal that the box is actually called the Ostium. Rather than killing monsters, it banishes them from this plane of existence. In addition, the Akrida are all linked to their queen so banishing her would kill all of the rest. The Monster Club performs a seance to summon Henry's ghost who reveals that the box's power source determines where the portal will go. Henry directs John to a piece of the power source that he was given in case of an emergency which proves to be a rock from the Akrida's home universe. By placing it on top of the box, the group is finally able to recharge it.
In a final confrontation with Rockin' Roxy, Mary succeeds in using the Ostium to banish the Akrida leader, leaving behind Roxy's burned out body. However, this fails to affect the other Akrida, revealing that Roxy wasn't actually their queen. As John and Mary are cornered by several Akrida, an injured Samuel uses the Ostium to banish them all.
