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There are some conflicting rules I'm trying to figure out in regards to the Chaos Defiler Battle Cannon.

Question 1: The Battle Cannon is str 8, ap 3, Ordnance 1, Large Blast. The Defiler is a Walker. In the Walker section of the main rules book on page 72 it says "Walkers and can move and fire all of their weapons, just like a stationary vehicle." Also in the box on page 73 it says they can shoot "All Weapons" whether stationary or moving combat speed. However, under Ordnance weapons on page 58 it says "Firing a massive ordnance weapon require the attention of all the gunners of the vehicle, no other weapons may be fire that turn (not even defensive weapons)." Putting aside the fact that walkers really don't have a crew per se, can the Defiler fire both it's Battle Cannon and Reaper Autocannon (or twin-linked flamer)?

Question 2: Just so I am clear, Ordnance weapons shoot using the same rules as what's listed in the Blast section of the rule book right? There isn't a section on how they shoot, but since they use the blast template, I assume it's pick a target in LOS, roll the scatter dice. If you miss, it's 2d6 minus your BS. Is that correct?

1.) The Battle Cannon (it's AP3 btw) rules override the Walker's rules and cancel out all other weapons. It's the same as a normal tracked vehicle standing still and firing it's ordinance weapon (I'm pretty sure about this one, since the Leman Russ has a special rule saying it could fire it's battle cannon and any hull mounted and sponson mounted weapons). The sheer shockwave of the attack makes it impossible even for the demon pilot of the Defiler to operate it's other weapons. Therefore you can only fire the Battle Cannon, or the Defiler's other two weapons.

2.) Yes. An Ordinance weapon is a blast weapon for the purpose of working out how it fires.

Yah the ap was a typo.

Well poo. So I can't fire the Battle Cannon, Reaper Autocannon and Havoc Launcher, all at the same time?

No, you can't ikky lol. The good news is when you lose the battlecannon, then you can fire everything else. Score!

just a note: Some(Incredibly Rare, with Valkyrie HellStrike missiles being the only one I can think of) Are ordinance weapons but not blast; they roll to hit as any other direct fire basic weapon using the BS of the model firing and are either hit or miss.

Note that the Defiler can switch out the two weapons for additional CCWs. It also has fleet just incase your cannon does get destroyed.

Yah, I'm going up against Tyranids so if I take a Defiler, I'm probably going to take the extra 2 CC weapons. I'm going to use the Battle Cannon to try and take out his Hive Guards in the back at first, then as stuff gets closer use it more for cc. Still haven't decided if I'm going to take the Defiler though.