Diaboli speak their own language, Diabolan. Diabolan words make frequent use of harsh, guttural hisses and the unique physiologic structure of the diaboli's forked tongue. While not difficult to learn, most humanoids of the Material Plane find mastery of Diabolan impossible. Most words in Diabolan contain soft "f" "s," "th," and "z" sounds.

Races speaking this language

Race name Rulebook name Edition
Diabolus Dragon Compendium Supplementals (3.5)