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So I know in the rule book it clearly states that re-rolls are applied before modifiers, but I'm unclear on this in practice.

Roboute Guilliman allows Ultramarines within 6" to re-roll any failed hit rolls. So as an example a Tactical Squad within this aura shoots at an enemy unit with a -1 to hit modifier, so with their BS 3+ an unmodified roll of a 3 is a successful hit and therefore can not be re-rolled. Then you apply the modifier and the unmodified 3 becomes a 2 and the hit fails. Is this correct? Or because you know the unmodified 3 will fail after the modifier is applied it becomes eligible for the re-roll?

Also if you are allowed to re-roll the unmodified 3, would this mean that if a unit had an ability to re-roll hit rolls of 1 and shot at a unit with a -1 to hit modifier that unmodified rolls of 2 become 1 and become eligible for the re-roll? As well as unmodified rolls of 3 being eligible for the re-roll against a -2 to hit modifier?

Goldenbrew wrote:
Roboute Guilliman allows Ultramarines within 6" to re-roll any failed hit rolls. So as an example a Tactical Squad within this aura shoots at an enemy unit with a -1 to hit modifier, so with their BS 3+ an unmodified roll of a 3 is a successful hit and therefore can not be re-rolled. Then you apply the modifier and the unmodified 3 becomes a 2 and the hit fails. Is this correct?

Yes, they have been pretty clear that this is how they want it to work. I find it really confusing though

Goldenbrew wrote:
So I know in the rule book it clearly states that re-rolls are applied before modifiers, but I'm unclear on this in practice.

Roboute Guilliman allows Ultramarines within 6" to re-roll any failed hit rolls. So as an example a Tactical Squad within this aura shoots at an enemy unit with a -1 to hit modifier, so with their BS 3+ an unmodified roll of a 3 is a successful hit and therefore can not be re-rolled. Then you apply the modifier and the unmodified 3 becomes a 2 and the hit fails. Is this correct? Or because you know the unmodified 3 will fail after the modifier is applied it becomes eligible for the re-roll?

Also if you are allowed to re-roll the unmodified 3, would this mean that if a unit had an ability to re-roll hit rolls of 1 and shot at a unit with a -1 to hit modifier that unmodified rolls of 2 become 1 and become eligible for the re-roll? As well as unmodified rolls of 3 being eligible for the re-roll against a -2 to hit modifier?

You were correct the first time. You reroll 1s and 2s, and then with your rerolled set of results, all 3s and below are misses. (number showing on the dice)

Goldenbrew wrote:
So I know in the rule book it clearly states that re-rolls are applied before modifiers, but I'm unclear on this in practice.

Roboute Guilliman allows Ultramarines within 6" to re-roll any failed hit rolls. So as an example a Tactical Squad within this aura shoots at an enemy unit with a -1 to hit modifier, so with their BS 3+ an unmodified roll of a 3 is a successful hit and therefore can not be re-rolled. Then you apply the modifier and the unmodified 3 becomes a 2 and the hit fails. Is this correct? Or because you know the unmodified 3 will fail after the modifier is applied it becomes eligible for the re-roll?

Also if you are allowed to re-roll the unmodified 3, would this mean that if a unit had an ability to re-roll hit rolls of 1 and shot at a unit with a -1 to hit modifier that unmodified rolls of 2 become 1 and become eligible for the re-roll? As well as unmodified rolls of 3 being eligible for the re-roll against a -2 to hit modifier?

To answer the highlighted question, yes this is correct. A roll of 3 with -1 to hit for a BS3+ model is a hit before modifiers and thus cannot be rerolled. Do I personally think this is a silly and unintuitive way of doing things? I do, but the rules are the rules. My suspicion is that they did not want people who had -1 to hit effects to feel "cheated" when you rolled a 2 which should miss, but now you get a re-roll and manage to hit, thus causing your rule that is meant to make you harder to hit make you easier to hit (although iirc the math on that isn't true, but feels > reals when it comes to game design).

There is an exception-I believe Cawl has a rule that lets friendly MARS units near him reroll hits-not JUST failed hits-so you can reroll any hit die, regardless of success or failure.

But for the most part, what's been posted above is correct. Marines near a Chapter Master reroll 1s and 2s on die when rolling to hit, and never 3s.

 JNAProductions wrote:
There is an exception-I believe Cawl has a rule that lets friendly MARS units near him reroll hits-not JUST failed hits-so you can reroll any hit die, regardless of success or failure.

But for the most part, what's been posted above is correct. Marines near a Chapter Master reroll 1s and 2s on die when rolling to hit, and never 3s.

Yep, just checked his entry, he allows you to re-roll all hit rolls, so even ones which normally wouldn't be allowed are infact allowed with him.

Thanks for the responses and making things a lot clearer for me.

I just wanted to further query a bit more.
When a unit has an ability to re-roll any hits (like the aura of Belisarius Cawl) you are able to re-roll the successful hits pre-modifier that are failed hits post-modifier?

Also say a unit had an ability to gain additional hits on a roll of a 6 and they shot at a unit with -1 to hit would they gain the additional hits? I know the Orks have Dakka Dakka Dakka but that states on an unmodified 6 so they would still get the additional hits. So is it impossible to gain the additional hits unless the rule states an unmodified roll of a 6?

Thanks again

Rules will either say Unmodified roll of 6, or on a Hit Roll of 6+. You can't get a Hit Roll of 6 on 1d6-1.

Goldenbrew wrote:
Thanks for the responses and making things a lot clearer for me.

I just wanted to further query a bit more.
When a unit has an ability to re-roll any hits (like the aura of Belisarius Cawl) you are able to re-roll the successful hits pre-modifier that are failed hits post-modifier?

Also say a unit had an ability to gain additional hits on a roll of a 6 and they shot at a unit with -1 to hit would they gain the additional hits? I know the Orks have Dakka Dakka Dakka but that states on an unmodified 6 so they would still get the additional hits. So is it impossible to gain the additional hits unless the rule states an unmodified roll of a 6?

Thanks again

1) Correct, because you can re-roll ANY hits, not just misses. You might theoretically want to not do too much damage to an enemy and so re-roll all or most of your successful hits hoping to miss.

2) It depends on the rule. AFAIK nothing in 8th only triggers on a 6, it's either a 6+ or an unmodified 6. For a roll of 6+, yes, a -1 to the dice roll makes it impossible to activate, because you'll never roll a 6 on a D6-1, the only available outcomes (as per the Designers Commentary) being 1,1,2,3,4, or 5. Likewise a +1 to the roll makes it more likely to activate, as a roll of 6 or 7 will activate it, the only available outcomes on a D6+1 being 2,3,4,5,6, or 7 (while also bearing in mind a 1 always fails irrespective of modifiers when it comes to Hitting, Wounding or Saving).