If multiple party members have a Gem of Efficacious Toxin at rank 25+, will the "All enemies you poison take 10% increased damage from all sources" debuff stack? So when multiple people apply the DOT, do you see 10% damage increase or more?
Diablo – Does the Gem of Efficacious Toxin’s debuff stack
diablo-3
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Best Answer
My research indicates that you will see only a 10% damage increase.
According to Wikia, a mob can only have one of this gem's '10% increased damage taken' debuffs at a time, irrespective of how many players are applying it:
This would appear to be backed up by a discussion on the US Battle.net forums: