Abyssal is a foul language of evil demons and summoned fiendish creatures. The language grammatically requires impoliteness and curses and has no word for "please" or "thank you", the closest words being "do it, fucker" and "good work, sucker".

The Abyssal Alphabet consists of scratch marks that can be made with claws on softer materials. In fact, proper writing requires the marks be made by claws, and other writing implements are considered to produce imperfect writing in the same way that bad handwriting is seen for more 'normal' languages.