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If a character uses precision to target a character in combat, can he resolve those attacks, and if the tarhet character dies does the defending unit then lose the benefits of the dead character when those remaining attacks resolve?

Eg, can my chaos lord use epic strategem to kill the technomamcer, so the wraiths dpnt get feel no pain when his terminators attack?

I don't believe so.

I think the way it works is that the Leader is considered part of the unit until the full attack sequence of your entire unit is done, even if killed with Precision weapons.

I may be wrong, so if someone wants to quote rules showing otherwise, that'll be good news for you.

From what I understood from looking into the +1 to hit if below starting and +1 to wound below half, any status effects that will alter combat cannot change while a unit is making attacks. So, the unit with the character that is using precision would have all their attacks against the wraiths still have the FNP, however, if you had 2 separate units attacking the same wraiths, the 2nd unit would not have to contend with this because once they start their attack sequence, the Technomancer is already dead.

I went rules digging, but couldn't find the exact passage, but I remember being showed the ruling on the sequencing a while back. If I come across it again, I'll come back and post the exact text.

From the Rules Commentary with emphasis added:

While This Model is Leading a Unit: These rules only apply while the model with that rule is part of an Attached unit, and otherwise have no effect. While a model with such a rule is part of an Attached unit, it will also benefit from its own rule. If an Attached unit contains more than one model with such a rule, both models are considered to be leading that Attached unit, and so all such rules apply. Such rules cease to apply if that unit ceases to be an Attached unit (such as when the last Bodyguard model in that unit is destroyed) – if this is as the result of an enemy unit’s attacks, all ‘while this model is leading a unit…’ rules cease to apply after the attacking unit’s attacks have been resolved.

Thanks all, reddit seems to agree that all the attacks take effect simultaneously ie the wriaths would get FNP in the attack from the unit that killed the technomancer, and it would only be attacks that happen after that.

I still cant find anything in the rules explicitly either way, but it makes sense to me.

You should look at my post above. It is the rules citation you are looking for.