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So, reading the Grey Knights codex today, I think that I've stumbled on a cool wargear combination. Namely, master crafting a Grand Masters Orbital Relay, similar to how IG can have twin linked orbital bombardments from a Master of the Fleet. However, my friends at the shop were adamant that I couldn't do this. They didn't really have much of an argument, but I think if you can twin link an ordnance blast weapon, then you can master craft one to some extent.

Can anyone provide a definitive answer, along with a way to explain it to somebody?

I snuck a look at the book while at a tourney today, the FLGS got the black box in yesterday. The problem with mastercrafting it is twofold since the wording is the exact same as in C:SM and C:BA;

First- It is not a weapon in the codex, it is a shooting attack that the model is allowed to make, similar to the Orbital bombardment of a C:SM Chapter master.

Second- It says the bearer is allowed to make a single reroll to hit per turn. IIRC the orbital relay is not carried, it gives them access to a special rule. As the codex isn't currently out, and wiser peoples than me haven't seen it, my two cents isn't worth much.

The officer of the fleet doesn't call down the Ordnance, the master of ordnance does. He does not twin link it, a special rule allows it to count as twin-linked namely the officer's order.

Also, master crafting allows you to reroll one failed to hit roll per turn, you don't roll to hit with Ordnance and blast, you roll scatter.

Unless master crafted lets you reroll the scatter die and the 2D6, but I don't think so as it specifically states reroll to hit.

Yet, you can get re-rolls to-hit with blast weapons...

Where the rule is to reroll all three dice.

To add to chromedog: Blast weapons specifically tell you that if you can re-roll to hit you get to re-roll the scatter dice. Orbital Bombardment is Barrage and Barrage weapons do not. The fact that Barrage weapons use the blast marker does not make them Blast weapons.

So the Grey Knights master crafting would have to specifically allow a scatter dice re-roll for it to be of any use with a Barrage weapon.

(note the number of edits? should not post before coffee!)

The rules for Barrage weapons, however, DO make them Blast weapons. Says so, right there at the top of the rules for barrage that they follow the rules for blast weapons, witht he following exceptions.

So it does! Thanks.

(This is why being prepared to post and make a total reading-fail idiot of myself is proving to be the quickest way to learn)

Nope, dont worry, I was only so certain as a question had been asked on this topic a couple days ago, in relation to direct firing barrage.