From Lexicanum

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Vaul is the Eldar forge god.

Vaul aided Isha and Kurnous in forging the spirit stones through which mortal Eldar could communicate with the gods, allowing Isha and Kurnous to teach and mentor their mortal children in secrecy. When Khaine tortured Isha and Kurnous during the War in Heaven, it was Vaul alone who called for their release. When Vaul narrowly failed to meet the terms established for their release, Khaine made war on him, maiming the smith and binding Vaul to his own anvil.

See also

Engine of Vaul