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From The PSUPedia
Poison is a status effect inflicted by the attacks of certain enemies as well as Poison Traps. A character inflicted with Poison will lose 2% of their max hp every 3 seconds for 12 seconds plus an additional 6 seconds for every level of the poison effect beyond first. This effect can be nullified by the Light-based recovery TECHNIC Reverser as well as the Recovery Item Antimate.