Canon

Sonic grenade

From Halopedia, the Halo wiki

Sonic grenades are a United Nations Space Command explosive. Several of them were used in the obstacle course set up by Colonel James Ackerson for John-117's and Cortana's first test with smart AI integration with the MJOLNIR Mark V armor on Reach, hidden amongst the Pillars of Loki and used in conjunction with napalm grenades.[1]

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