Extermination
From Halopedia, the Halo wiki
Extermination is a medal in Halo 3, Halo: Reach, Halo 4 and Halo Infinite multiplayer.
In the first three appearances, it is a Legendary medal awarded for killing the last alive player on the opposing team with at least an Overkill that results in the entire team being dead at once. In the first two games, it is represented by a gray cross with a red skull, and in Halo 4 it represented by a white skull on a red hexagon on top of a 16-pointed grey star.
In Halo Infinite, it is a Mythic medal which is awarded for solely wiping the enemy team in a round of Elimination.
Summary
This medal can be considered very difficult to earn, requiring a player to not only encounter four enemies together but also successfully and quickly kill the team. The medal is likely more common in game modes such as SWAT as time-to-kill can be instantaneous.
It can also be obtained by killing the person who is in a team consisting only of himself, four times within four seconds of each kill.
In Halo: Reach, it is possible to earn an Extermination without getting an Overkill.[1] The exact specifics are unknown, but the medal seems to require one to get 4 kills on the same team in about the maximum time you can get an overkill in (12 seconds) instead of the Overkill medal itself.
Halo Infinite
The medal was only available within the Extermination gamemode, where the player performs an Extermination within one round. In August 9, 2023, the medal will be available in all multiplayer modes via an update during Season 04: Infection.[2]
Achievements
The following achievement is related to the Extermination medal.
| Halo 3 (Xbox 360) | Title | Unlock requirement | Gamerscore 
|
|---|---|---|---|
 |
Have Fun Respawning | On a Mythic map, got an Extermination during a ranked or social match. | 25
|
Gallery
The Halo 3 version.
The Halo: Reach version.
A player receives the Extermination medal in Halo: Reach.
The Halo 4 version.
The Halo 5: Guardians version.
The Halo Infinite version as seen in the Technical Previews.
The Halo Infinite version.
Sources
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