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"Use the gas bombs!"
Supreme Chancellor Palpatine, giving the order to kill the Zillo Beast[src]

Gas bombs were a type of ordnance that carried poison gas. These bombs were used to kill the Zillo Beast that rampaged across Coruscant around 22 BBY. The poison had been developed from Malastarian fuel by Doctor Sionver Boll specifically to kill the Zillo Beast. Supreme Chancellor Palpatine personally gave the order to use the bombs against the beast.