Ninjas Work Better Alone

Kennen, Akali, Shen and Zed all have a particular buff labeled: "Ninja". It says: "This unit is a flippin' Ninja!".

Although it is rather cool, it sometimes has a negative effect. If two, three or four Flippin Ninja's are in the same team, they all loose either -1, -2, or -3 HP, depending on the amount of Flippin Ninja's in the team. Therefore Ninjas work better alone, though it only has a minimal impact on the game.