An energy cutlass is a Covenant melee weapon primarily used by the Kig-Yar. It is a shard of glass-like crystal and is pink in color. The Kig-Yar use them primarily to dispatch enemies in close-quarters fights. The weapon has a self-destruct ability, causing it to explode when the sequence is activated. The Unggoy also used energy cutlasses on the Tiara during the First Battle of Harvest.