The Blade of the Master (event) was a Gifting Event similar to Get the Power of the Ancient. It required the Mission Items Ninja Stars, War Fans, and Ninja Masks. You have 10 days to complete the set and earn the Epic Ability. The event began on August 25th 2011 and ran until September 4th(?) 2011.
The Master's Blade
Do you possess the arcane powers of the ninja? Your stealth, cunning and guile shall earn you the Blade of the Master.
You must collect 30 of each item to complete the ability set.
Each ability had 3 levels of mastery. Mastery of all abilities earns the ability Blade of the Master.
See: Blade of the Master (ability set)