Killing Spree

From Halopedia, the Halo wiki

Summary

Awarded after killing 5 opponent's without dieing in any Multiplayer gametype.

The Killing Spree Medal is awarded for killing 5 opponents in a row without dying. It is available in all Multiplayer gametypes and has a Bungie difficulty rating of 6 (out of 10). This is represented by a gray 4-sided star.