The language was created by the Vala Aulë, the creator of the first Dwarves, who taught them "the language he had devised for them," implying that Khuzdul is a constructed language even within context of the books. The language was rarely heard by outsiders and was a secret. The Dark Elf Eöl, who was a great friend and confidant of the Dwarves may have been verse in it but this is not recorded. Only one saying entered recorded history, the battle-cry, "Baruk Khazâd! Khazâd ai-mênu!", meaning, "Axes of the Dwarves! The Dwarves are upon you!".
According to the Lhammas, Khuzdul is unique in belonging to a separate language phylum, Aulëan, not related to the languages of Elves, which are in the Oromëan language phylum. Aulëan was named from the Dwarvish tradition that it had been devised by Aulë the Smith, the Vala who created the Dwarves.
There are many similarities between Khuzdul and the native tongues of men, such as Taliska, the language of the first and third houses of the Edain. This is because in the early days of Middle-earth, before men crossed the mountains into Beleriand, they had contact with the Dwarves of Erebor and further East. Taliska was the ancestor of Adûnaic, the tongue of Númenor, and the direct ancestor of the Common Speech, and both languages still had Khuzdul influences.
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