You have probably heard about the five undead languages used in the fifth edition of the Pathfinder RPG, but did you know that the undead still speak the same languages they used to speak when they were living? These languages are known as the common, druidic, infernal, abyssal, and abode languages. Below you will find the list of the most common undead languages used in the game, along with descriptions of the rules for each.

Common

Undead don't have their own language; they speak whatever they used to speak when alive. This is particularly important for the Favored Enemy feat, which requires the player to speak a language that they have learned as a child. Though some undead may speak several languages, the vast majority of them speak a single common language. 

In 5e, this diversity is the most noticeable, as undead are often quite mindless. The most common language for older undead is Draconic. It was originally spoken by the ancient giants. Later, it was brought to Eberron by fiends. Common undead languages in 5e include Elven, elf, and drow. Also, the game's Supernal languages are closely related to the shadow plane. This gives some warrant for the infinite nature of the Afterlife.

Druidic

For druids, Druidic is the secret language that only they speak. As such, it doesn't take up a language slot. Using a Druidic spell, a dead creature is transformed into an undead skeleton or zombie. It's a secret language because only druids speak it, but the spell does give you the advantage over undead. Other races may speak different languages, and druids can speak multiple languages. 

Some of the most common languages in the game are elf, half elf, and ghoul. The language of a dwarf, giant, or ogre is Giant. Similarly, grells speak Grell. There's also a language for slaads. The undead languages are usually the same.

Infernal

The Infernal Undead are known to speak a variety of languages, including Necril, a language from the earliest days of the human race. Necromancy and the dark arts are associated with this language, as is Umbral, another eerie-sounding language. 

Supernal languages, meanwhile, are based on the shadow plane and fit in with a Christian Heaven/Hell pantheon, and provide warrant for the infinite nature of the Afterlife. The Infernal language is spoken by demons, and was originally a tongue of the Shavarath plane. Fiends brought it to Eberron during the Age of Demons.

 A spell known as Comprehend Languages can be used to understand the spoken language of an unknown creature. Some creatures, such as kenku, do not speak a language but can mimic the sounds of other creatures.

Abyssal

The language of the undead, Abyssal, is a type of Exotic Language. Its most common speakers are demons and death knights. They speak infernal script, and death knights are immune to poison and necrotic damage. Abyssal speakers are a different breed, as the majority of them aren't native to the Eberron plane.

The Undead don't speak their own language, unlike the liches and vampires, who can communicate with each other by body language and random sounds. Regardless of their race, they can still understand each other and spread mischief. The Abyssal languages are based on those of demons. 

These languages are derived from the plane of Shavarath, and fiends brought them to Eberron during the Age of Demons.

Qualith

The mind flayer speaks a unique racial language called Qualith. The language is a combination of four-line stanzas and is read using psychic abilities, while most undead creatures cannot decipher it. The illithids, however, have a native written language: Undercommon. 

This language is a combination of undead dialects, and a slew of other languages are also spoken by Illithids.The five-edition D&D game provides several options for undead languages. There are two categories of languages: undercommon and deep speech. 

Both of these languages cover all types of aberrations. Qualith is an alien written language, and non-illithids can only understand it with the use of magic. The other language is Giant, and it is spoken by ogres and giants. The Firbolg language has roots in the Chinese word minotaur.|