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Nurgle daemon loci gives +1 damage on a roll of a 6.
Stratagem gives plagueswords damage 2 instead of 1
VB gives +1 to wound and on a 7+ they do double damage

So on a roll of a 6 to wound with all three in play would you double 2 to 4 and then add 1 for 5 total damage? Or would you add the 1 from the loci to the 2 damage to make 3 and then double it to make 6 damage.

Rule book says to multiply characteristics first and then apply addition type modifiers after, however this is in reference to a model's characteristics and not the characteristics of their weapons such as damage.

This is more relevant when not using the stratagem for units without plagueswords, so rolls of 6 would be doing 4 rather than 3 damage if you add the plus one damage first before doubling it.

Thanks

This was clarified in one of the faqs..

You determine the base value of the weapon, then apply any unit modifiers.
This sequencing breaks the bodmas up into two calculations.
(Going to try and wake up a bit more before working out the actual answer in this case)

I don't think it was clarified in any FAQ to be honest I just checked the rules one, the designer commentary and the daemon one and there's nothing about what I'm asking here

Very first question in the designers commentary.
It's talking about strength rather than damage but the same principles apply.
..or do they. Yeah I'm not 100% sure on this.

Have a plague Drone with fleshmower have Blades of Putrefaction and virulent blessing cast on it, while in range of locus of nurgle and now your in for a real treat.

For the rules, the stratagem is clear cut, the weapons are d2 and should be double from there.

For the orhers, i cant find anything suggesting the locus of nurgle happens before the inflict damage situation (if it said something like “increase the weapons damage characteristic of 1” you could have argued differently. But it seems like the buffs stay until the last step of fighting and then, as you said, multiplication happens before additions, resulting in 3 damage swings or rather weapon damage x2+1 for a generic formula.

Q: If a rule modifies a model’s Strength
characteristic, and that model is equipped
with a melee weapon that also has a
modifier (e.g. ‘x2’), could you explain
the order in which the modifiers are
applied to the characteristics and the
weapon’s Strength?

A: First you must determine the model’s
current Strength characteristic. To do so
apply all modifiers to it that multiply or
divide the value, then apply any that add
or subtract to it. Having done this, you
then modify this value as described by the
weapon’s Strength characteristic.

None of this applies here, because its only about strength, not damage. If we apply the same principle to damage calculation it would be 2 base damage from plague banner, multiplied by 2 for virulent blessing, adding 1 for the nurgle loci, resulting in 5.

Ok lets run through this step by step.

Virulent Blessing:Wound rolls of 7 inflict double damage (fight phase only)

Locus of virulence: (inflict one additional damage) Always on.

Plague Banner: increase damage characteristic to 2 (one phase)

The way I see it, the plague banner increases a base characteristic, so that will always take place first.

Locus of virulence will always add one to the damage result.

Virulent Blessing will double the Base value. But will not double Locus of virulence.

So if all bonuses are applied, the result will be 5.
2 base, doubled, then one additional.

I'm happy to play it like that. Not happy GW continue to make stupid mistakes like this in every single edition without us giving us the chance to ask them about it so they can put it in an faq

Damage is a characteristic the same as strength. The FAQ and core rules apply.