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personally, i'd ask you to use the generic marine codex if you wanted to use devastator squads. less heavy weapons is the price you pay to use BT's and SW; in exchange, you get a ton of benefits. i think you'd be more likely to have an opponent agree to it if you voluntarily gave up something like your special vows in exchange for it. the above is true for regular 40k. if you're playing apocalypse, what you're proposing is completely legal (as is pretty much anything in apoc).