The Collector and the Factory

The Collector does not shoot. It picks up the debris fallen enemies leave behind, and that debris is the raw material of everything that follows.

From it you build a production line: a belt carries the material, a splitter routes it, and an assembler turns it into something better. Debris becomes hardware and biological matter; those become metal and copper , which feed the special ammunition .

The advanced towers cannot be built with gold alone — they ask for these materials, which is why the collector is important.