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This article is about the medal. For the Halo Wars achievement, see Killjoy (achievement).
H3 Medal Killjoy.png

Killjoy is a medal awarded and in Halo 3, Halo: Reach and Halo 4 multiplayer for killing a player who is on a Killing Spree of five kills or higher. It is represented by an octagon with a crossed-out smiley face in the middle.


Earning a Killjoy on a Halo 3 Mythic map will unlock the Awww, Too Bad achievement.

In the Halo 3 multiplayer beta, the medal is depicted by a yellow-outlined octagon with an orange interior and a black silhouetted Master Chief based on Halo 2's concept art.