The Incendiary Grenade is the most convenient way to build a fire in Mega Primus. Instead of toting an Auto Cannon with incendiary ammunition, Agents can simply pack a few Incendiary Grenades. In stark contrast to the sleek lines and polished surfaces seen throughout Megapol's and Marsec's product lines, Incendiary Grenades are crudely but robustly constructed by Diablo.
Although fire is not the most efficient way to kill enemies, its psychological effect is enormous: any unit caught in the flames will stop fighting and try to escape. Armor protects against fire very well, but even Agents in Disruptor Armor will run hysterically out of the flames. Disruptor Shields provide no protection against the heat. Note that fire will destroy both terrain and items, so be sure not to leave anything valuable in the flames!
"A grenade which disperses an incendiary agent, creating fires within a large radius. The incendiary grenade was originally created by Diablo and is popular with many of the city's criminal gangs."