Languages of the Planes (PWH)

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Not everyone speaks the same language on the planes. On Mechanus all languages are automatically translated, but in other places, spells like tongues come in very handy. Communication is important, and with an area so large and so full of diversified intelligent beings, it can sometimes be extremely difficult.
==Planar Common==
Most planars know a language referred to as Planar Common, or Planar Trade. In fact, the language stems from the earliest planar settlers from the Prime, who brought their Common tongue with them. Although the language has seen many new variations develop (including the cant, or planar slang), it remains essentially understandable even by the greenest primes.
Many native planar races look down upon this common tongue, regarding it as a backwater prime carryover. Others see the value in a common language; in fact, the Lower Planes had established a trading language even before the advent of Planar Common.
It's assumed that all PCs, prime or planar, speak this language. Not all NPCs speak Planar Common, however. Even when they do, most folks enjoy conversing in their native tongues rather than a simple trading language.
==Other Languages==
All planar player characters may choose starting languages as usual from the following list, although other "Prime" racial languages, such as elvish, dwarvish, orcish, lizard man, and so on are also available with the DM's approval. Languages should be appropriate to the character's origin plane and background.
Archon 	Guardinal
Asuras 	Khaasta
Baatezu 	Lower Planar Trade
Baku 	Marid
Bariaur 	Mephit
Bladeling	Modron*
Dao 	Nereid
Djinni 	Night Hag
Efreeti 	Slaad
Eladrin 	Sylph
Formian 	Tanar'ri
Gehreleth	Tso
Githyanki	Yugoloth
Githzerai	
: * Modron speech costs two slots due to its basis in unique concepts.
Other races have languages, but they are generally not available as starting languages. Some, such as dabus, are impossible for PCs to ever learn. Aasimar, genasi, and tieflings (like half-elves) do not have their own languages.
DMs should take note that most intelligent creatures of the planes know at least two of the above languages, and possibly Planar Common as well.