double throw,double swing

[adeyke]

When a barb uses 'double swing' or 'double throw', do the mods (including the damage) of each weapon stack? For instance, do the mod '-25 % to target's defense' of each weapon stack to make -50% ?
The mods should stack because the target is hit by the two weapons at the same time,unlike frenzy for instance for which case,the mods of the two weapons don't stack.

~Abramelin~
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In a word: no.

If a property is flagged "damage-related" (e.g. ED, elemental damage, AR, CB, -% target defense, etc.), and it's on a weapon, then it doesn't affect the other weapon. It doesn't matter which attack you use.