Flashing Blades

Acquisition

 * Lou, of the Knives (Shenzun Tunnels) -- triggered boss by walking into a pit near where you protect Mhenlo and Master Togo.
 * Waeng (The Undercity) -- Only during the Assist the Guards quest.

Usage Notes
With sufficiently high Dagger Mastery, an assassin can have this skill constantly active, to keep received attacks to a minimum.