Critical to the financial success of both sides, the Harvester is the only unit capable of collecting Tiberium for refinement. Harvesters will automatically begin to collect Tiberium if they arrive with a Tiberium Refinery, but not if built from the War Factory. If it carries the more valuable, but also more volatile blue Tiberium strain, the Harvester becomes highly unstable, and explodes violently if destroyed, which can be used offensively as a poor man’s demolition truck.