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It is a shard of glass-like crystal and is pink in color. The Jackals use them primarily to dispatch various enemies in close-quarters fights, especially when boarding an enemy ship in the same manner one would use a combat knife. The weapon also seems to have a self-destruct ability causing it to explode when the sequence is activated.
- The Energy Cutlasses blade may be made from the same material as Needler rounds due to their similar properties.
- In the 11th Halo Anniversary terminal, a Kig-Yar with an energy cutlass is shown attacking 343 Guilty Spark.