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Under the new Daemon Codex, let's assume that a unit of Plaguebearers is under the effect of the Locus of Virulence (if you roll 6+ to wound you do one additional damage) and Virulent Blessing (+1 to wound, and if you roll 7+ to wound, you do double damage).

How do these two buffs interact with each other? Conservatively, a Plaguebearer who rolls a 6 to wound will do 3 damage with that attack (normally 1 damage, doubled to 2 by Virulent Blessing, +1 from Locus of Virulence). An aggressive interpretation would give the Plaguebearer 4 damage (normally 1 damage, +1 from Locus of Virulence, doubled to 4 by Virulent Blessing).

I lean towards the conservative approach because a Plaguebearer doing 4 wounds with a single attack is just plain silly, but what do you think?

The rules on applying Modifiers in the Core Rules will tell you. Multiplication/division first, then addition/subtraction.

Exact quote: "You may also encounter abilities and rules that modify a characteristic. All modifiers are cumulative, though you should apply any multiplication or division to the characteristic (rounding fractions up) before applying any addition or subtraction."

Brian888 wrote:
Under the new Daemon Codex, let's assume that a unit of Plaguebearers is under the effect of the Locus of Virulence (if you roll 6+ to wound you do one additional damage) and Virulent Blessing (+1 to wound, and if you roll 7+ to wound, you do double damage).

How do these two buffs interact with each other? Conservatively, a Plaguebearer who rolls a 6 to wound will do 3 damage with that attack (normally 1 damage, doubled to 2 by Virulent Blessing, +1 from Locus of Virulence). An aggressive interpretation would give the Plaguebearer 4 damage (normally 1 damage, +1 from Locus of Virulence, doubled to 4 by Virulent Blessing).

I lean towards the conservative approach because a Plaguebearer doing 4 wounds with a single attack is just plain silly, but what do you think?

Edit: By the Man-Emperor of Mankind's left pectoral, I am stupid.

Page 175 BRB, Modifying Characteristics. Damage is a characteristic, as per the line under section 8 of page 175. "The weapons that a unit comes equipped with are described using a set of characteristics as follows:"

3 damage.

There is a more extreme example of modifying damage characteristic in the tyranid FAQ.

Q: My Behemoth Hive Tyrant, armed with toxin sacs and the
Reaper of Obliterax, has the Monstrous Hunger Warlord Trait.
If I were to roll a 6 to wound in the Fight phase, would the final
damage be (3 for the bonesword lash + 1 for toxin sacs + 1 for
the Warlord Trait) × 2 for the Reaper of Obliterax’s ability for
a total of 10, or 3 for the bonesword lash × 2 for the Reaper of
Obliterax’s ability + 1 for toxin sacs + 1 for the Warlord Trait
for a total of 8?
A: You multiply the weapon damage for the Reaper of
Obliterax ability, and then add 2 for the combination of
Monstrous Hunger and toxin sacs for a total of 8.