In Dead Island: Riptide on the PC, PS3, and Xbox 360, each character has a different Fury move that is more devastating than regular attacks.
To enter Fury mode, you first need to have a full Fury bar. You’ll see a circle next to your health bar that slowly fills up as you fight zombies, this is the Fury bar. When this circle gets fully red, then you have a full Fury bar.
With a full fury bar, press and hold the Fury button for a moment to enter Fury mode. On Xbox 360 this is the B button, on PS3 this is the Circle button, and on PC it’s either the Z or H buttons, unless you have changed your key layout.
Fury mode will only last a few seconds, so make sure you use it when you really need it. You may want to save it for harder zombies as well.