Extermination is a special medal that is featured in Halo 3 and Halo Reach, it can be gained by terminating every single member of the opposing team at once. This means that each member of the opposing team must not spawn before the others are dead to gain this medal. It is considered one of the most hardest medal to achieve, since you can't be too lucky to find all opposing members hanging around together, not in huge maps. There has to be a minimum of 4 people that you just killed.
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