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What happens exactly when bunch of grav shoots Armorless spawns and 1 marine biker? Majority toughness is 6 but grav wounds on armor.

If the biker with 3+ is out in front of the joined spawns, does it matter?

Most common method is to replace "toughness" with "armour save ". So wound on majority armour save, ie 6+.

IIRC most people do Majority armor. so wounding against unarmored.

i dont think there is any sort of FAQ for it.

Unknown, grav rules don't cover units with mixed armor saves.

You'll have to house rule it

Grav weapons wound in the same way as normal weapons using the majority armor save. This exact thing came up about two weeks ago in a game I played. If a unit has no save the grav weapons still wound on a 6+. Keeping spawn with your Chaos lord is an extremely powerful way to protect him from grav weapons.

SittingInACorner wrote:
Grav weapons wound in the same way as normal weapons using the majority armor save.

That is a house rule. a widely accepted one, but a house rule none the less.

Almost everyone I have encountered plays it that way, but YMMV.

There is no rule with grav weapons which changes the basic rules:

First you must work out to hit. Then you work out how to wound the unit, this is based on majority toughness. Grav weapons wound based on armour, rather than tougness so you use majority toughness.

Or is there a suggestion of working out each hit one at a time, basing to wound on only the closest model (or something else)?

No, the suggestion is that there are literally no rules to cover it. But majority armour is definitely fair.

If only we could have the Tide of Spawn formation in the regular Chaos Marines codex.....

Where can I find the tide of spawn formation?

Grief wrote:
Where can I find the tide of spawn formation?

its an apocalypse formation

2 ways to do it.

Majority armour, or individual roll off.

Majority armour is the better of the two because individual roll off turns grav cannons into sniping weapons that are in some out of sequence hell.

Really what you do is fire the bolters first and thin down the 6+ saves. You'd be surprise how often it makes a huge difference.

-It is very simple. Like with Toughness (For most weapons) and Initiative (For Warp Spiders) you roll against the majority. Being that the spawn are without a save the 6 to wound is required. Until the squad is reduced to one armored target and one unarmored target in which case the highest (the sorcerer's armor) is used.

Multiple Toughness Values... roll to wound against using the toughness characteristic that is the majority... If two or more toughness values are tied use the highest... PG 34
+
The roll To Wound when firing... always equal to the armor save of the target to a minimum of 6+... PG 164
= Not a very complex thing to understand.

SlickSith wrote:
-It is very simple. Like with Toughness (For most weapons) and Initiative (For Warp Spiders) you roll against the majority. Being that the spawn are without a save the 6 to wound is required. Until the squad is reduced to one armored target and one unarmored target in which case the highest (the sorcerer's armor) is used.

Multiple Toughness Values... roll to wound against using the toughness characteristic that is the majority... If two or more toughness values are tied use the highest... PG 34
+
The roll To Wound when firing... always equal to the armor save of the target to a minimum of 6+... PG 164
= Not a very complex thing to understand.

Just want to point out that people at my FLGS and I think a lot of dakka users, agree that the two or more tied values using the highest means using the one that is best for the defender. So when a 6+ and a 2+ are left they would still be wounded on 6's. Feel free to play it however you want as I don't believe any one house rule is inherently better than another.

Also (this doesn't matter with spawn) but technically a 6+ save is "higher" than a 2+ save.