Anvil of the Void (Assault, III) - Dragon Age Guide - IGN

F: At location F, the first of two bosses here can be found. The boss here is some sort of strange stone-headed device that constantly turns, spawning enemies.

Dragon Age Guide - IGN

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Anvil of the Void (Assault, I) - Dragon Age Guide - IGN

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Anvil of the Void (Assault, II) - Dragon Age Guide - IGN

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Dragon Age: Origins - Anvil of the Void Fight Made Easy! (Spirit Apparatus Puzzle)