| Category | Languages |
| Type | derived from Supernal |
Linguists refer to it as a War Tongue, a language specifically crafted for warfare, with words entirely fabricated to express military commands and carry over the din of battle. Known today as Infernal, it is a subset of Supernal. While understanding Infernal implies mastery of Supernal, the reverse is not true. The language originated in the Forge Worlds, during the creation of Asmodeus's secret Devil legions. It served as a battle tongue for units destined for the covert Covenant invasions of the Abyss.
Infernal is extensively utilized across the Forge Worlds. It serves as the principal language of devils and the Neogi populace.