| Category | Languages |
| Type | derived from Supernal |
Linguists call it a War Tongue, a language built for war, words entirely made-up for expressing war, commands, and carrying over the noise of battle. Known today as Infernal, it is a subset of Supernal. If you know Infernal, then you know Supernal, but not the other way around. The origin of the language came about on the Forge Worlds, during the making of Asmodeus's secret devil legions. It was a battle tongue for units destined for the secret Covenant invasions of the Abyss.
Infernal is widely spoken on the Forge Worlds. It is the primary language of devils and the Neogi.