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So, if you are using Fateweaver that allows you to reroll failed saves within a certain radius and are in a SM librarian null zone that forces rerolls of successful saves, what order do they go in, or which takes precedence? Do you reroll your initial failed, then reroll all the resulting successful ones, or do you reroll all your initail successes and then get to reroll those failures plus any initial failures?

It's simple.

Imagine you had 6 saves.

You make 4 and fail 2.
(you can only make one reroll)

Those 4 saved, are re-rolled due to Null.
Those 2 failed, are re-rolled due to Fateweaver.

End Result is what sticks.
Basically you apply which ever rule to whatever result of the dice when appropriate, but only once.

Fatewarver then null zone. Ill explain.

You must establish your (Final value) of your saving throws first.

Toss 10 dice, 5 save 5 dont. Per fate weaver you reroll failed. Of the 5 dice 3 more save for a total of 8 saves. THIS is your fianl taly of saves and fails.

NOW Null zone affects the 8 dice and you reroll those 8.

YOu cant do Null zone first for there are no saves rolled yet, in effect you would be -interupting- fateweavers rule by having to use it after fate has rolled one set of saves before his rerolls. (fateweave rolls saves/null zone effect is applied/fateweaver rerolls fails) This breaks standard dogma of applying rules in whole untill effect complete. I cannot think of any rules in 40k that allow a player to break/pause another effect.

You can't reroll a reroll though, that's RAW.


Automatically Appended Next Post:
I think this is answered in a FAQ, I'll dig.

Edited,

Sanctjud is correct, just read a exact issue with fantasy. DE vs HE Reroll hits and reroll misses.

Basically reroll all the dice as was indicated in sanct's post. The second roll sticks. the reason being youll only have hits or misses and sine each effect rerolls the other they technicaly cancel eachother out. so you reroll the batch and take the second result.

Page 61 of the INAT FAQ supports my post.
I did not find anything in the GW FAQs.

So... I think you'd have to house rule it.

EDited my post above yours Sanct, you are correct.

I'm no probability genius, but you're re-rolling every dice in this scenario, so doesn't that mean you could just roll once and skip the rerolls to save time?

I think it comes out exactly the same.

It should, yes, and many (most?) people do exactly that.

Mike Leon wrote:I'm no probability genius, but you're re-rolling every dice in this scenario, so doesn't that mean you could just roll once and skip the rerolls to save time?

I think it comes out exactly the same.

It does. But you'll need to reach agreement with your opponent first, as you aren't precisely following the rules.