Poisoned Arrows is a unique technology available to the Malians in Age of Empires IV: Anniversary Edition that can be researched at the Archery Range starting in the Castle Age. After researching, Archers will inflict an extra damage over time effect with their arrows, dealing 3 damage over 6 seconds. This effect stacks for every archer.
Like with all Malian technologies, the Manuscript Trade civilization bonus reduces the research time of this technology depending on how much gold has been obtained through trade.