Alter Aeon Online Help

Keywords are:  'thief skill shadowworks works'

Skill: shadowworks              Lvl 33 Thie  (28%)
                                (helpful)   Requires: flashbombs and shadow mastery
                                Group: Thief tinkering
                                Profession

This skill allows thieves to build grenades that use summoned shadow
components.  This includes the darkness-producing shadow bomb, and the
deadly cutting shadow blade grenade.

See also 'help build grenades' for more information.