Infernal

The language of Devils and Tieflings.
Devils are known for their pursuit to corrupt people that crave power. They create eldritch contracts that bind the signee to the terms within. Tieflings are a product of these contracts made with humans in the years following The Rupture, and as such, they have a unique connection to the Devils.
Infernal has a lot sounds that sound like subtle curses when pronounced. It has whispers and hisses that are unsettling to the normal ear.