The Heaven-Slayer is a sword forged by Hephaestus.

First appearance: BTI 209

Known users

Hephaestus, Noriko Null, Viper, Quantum, Apollo

History

The only weapon known to be able to damage Neutral Matter, its creation took a hundred thousand years and was intented as a precaution against a possible Talos rebellion. Noriko Null learned of its existence when accessing the database of the Vulcan Forge, but it was recovered by Viper years after the demise of Hephaestus.
Noriko Null acquired the sword after defeating Viper and used it as a weapon against Tiamat
This is when the sword acquired its current name; it’s unknown how Hephaestus called it.
Quantum was able to use the sword in the final attack against Enyo that granted him the title of Strongest Under The Heavens.
The sword was briefly held by Apollo, but he returned it to Null soon thereafter.