The Endless Winter is a device created by the Nexus host Sefer to fight Kthe Olympian gods.
The device is connected to a parallel dimension where the lowest possible temperature is much below that of his original universe.
It can freeze an entire planet in a matter of seconds and can hold a Class-3 god for years.
The device was incorporated into the Winter Armor by Hephaestus and later upgraded by the Scribe.
After becoming the new Ice Queen, Leiko Tanaka installed the Endless Winter inside her body, replacing her own heart.
First appearance: BTI 118 (as part of the Winter King’s armor)