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Keywords are:  'thief skill advanced antidotes'

Skill: advanced antidotes       Lvl 29 Thie  (21%)
                                (helpful)   Requires: brew antidote
                                Group: Thief poison skill group
                                Profession

A thief skilled in advanced antidotes can sometimes create antidotes that, in
addition to curing sickness, can also cure advanced side effects of poisons.
This is a passive skill, and used automatically whenever the thief attemps to
brew antidotes.