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I have been reading through Siege of Vraks Volume 2 and the Astra Militarum Codex but it seems the profile for the Medusa gun is not around.

Only profile I can find is the Breacher Shells in Vraks Volume 2.

Anyone know what book you use for the rules for the Medusa Cannon?

The medusa cannon's profile is in the weapons summary on pg 272 of the vraks book

Apparently I'm blind lol.

Cheers