Killtastrophe is a multikill medal awarded in Halo 3 Multiplayer for killing 8 opponents within 4 seconds of each previous kill. It is represented by a blue circle with eight silver stars. This medal is extremely hard to get because of the combined difficulty of killing eight people in a row without getting killed within a certain time limit. A way of getting it is to throw a tripmine into a group of enemies. To further this effect, throw a grenade with the tripmine. This will cause more damage and finish off people who have their shields down from the tripmine. There are only two medals above this prestigious medal, which are the Killpocalypse and Killionaire Medals.
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