Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Overdrive
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The steam-driven pistons that have replaced Astragoth's muscles and sinews allow him to strike his enemy with mechanical force.

If Astragoth successfully hits with all 3 of his attacks, then his mechanised arm goes into overdrive, pounding, smashing and stabbing faster than flesh and bone would permit. He can immediately make an additional 3 Attacks. These attacks may not generate any further additional attacks.

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