Okay after doing some testing with this enhancement i have a few things to say. I did my testing on my Master Mind for starters. It seems that the build up buff is put onto the pet who proced the effect, and not the master. If the power it is slotted into summons multiple pets, only the individual pet who procced the build up will receive the buff. When I was testing it the build up buff proced very often, and if your pet is quick enough it's possible the buff could stay up permanently. The buff boosts your pets accuracy and dmg by 30%