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Keywords are:  'thief skill advanced poisons'

Skill: advanced poisons         Lvl 21 Thie  (21%)
                                (helpful)   Requires: brew poison
                                Group: Thief poison skill group
                                Profession

When brewing poisons, a thief skilled in advanced poisons can sometimes brew
poisons that have additional detrimental effects. This skill is passive, and
used automatically whenever the thief attempts to brew poisons.