There are two different ninja greegrees. This is made using bones from Padulah or Duke, Oudai, Uodai or Ouhai summoned by Ape Atoll residents (level 149), although players don't have to kill the summoned ones (Karam kills them). However, getting these from killing Padulah directly is recommended as it is much simpler. There is a glitch if you get caught and you try to switch back to your monkey form, there is a small chance you will lose your greegree. However this glitch is not common. The Sleeping Monkey does NOT summon guards.