Talk:Quests/@comment-27.145.182.175-20150518160604/@comment-216.186.67.70-20160208180901

It means that two Flurry Boost I abilities won't stack. You can have multiple different Boosts simultaneously, but two of the same boost at the same level won't stack. However, if you have one unit with Flurry Boost I and one with Flurry Boost II, the higher level ability will take precendence.