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Keywords are:  'thief skill shadow blades'

Skill: shadow blades            Mana:  20  Move:  15  Shadow Cost:  10  Lvl 17 Thie  (28%)
                                (critical)   Requires: shadow bind
                                Group: Thief shadow disciplines

Usage:
shadow blades

The thief shapes darkness into a number of small blades, which can be used with
the knife throwing skill. After a time the blades will melt back into the
shadows.