Infernal

Infernal is said to have been originally spoken by creatures of Cruternum, which is why the Helveri can speak it. Helveri often speak it so that no one else can understand them when they want to communicate among themselves. Since there are quite a few of them, the language is also relatively widespread, not just among the Helveri. Infernal is written in a very harsh but elegant script, longer texts look like dancing flames drawn on paper.