Alter Aeon Online Help

Keywords are:  'thief skill poison handling'

Skill: poison handling          Lvl 13 Thie  (42%)
                                (important)   
                                Group: Thief poison skill group

The 'poison handling' skill is a passive skill that works any time you
brew or handle poisons.  With the skill, you'll be less likely to poison
yourself, and if you do you probably won't be poisoned as badly as you
otherwise would have been.

Note that if you have poison handling, you will be able to bottle poisons,
even if you don't know the 'potion bottling' skill.