Mage's Running Boots are light boots in Dragon Age: Origins - Awakening.
Dragon Age: Origins - Awakening Edit
Sold by Yuriah
in the throne room
of Vigil's Keep
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The Golems of Amgarrak Edit
Can be looted from a Maimed corpse in the Deep Roads Grotto, just past the Runic Golem in The Golems of Amgarrak DLC.