"The Suma will not leave this planet, until we secure more catalyst." This article is a stub. You can help Grey Goo Wiki by expanding it. Brush is a terrain feature in Grey Goo that allows most units to conceal themselves. Retrieved from "https://grey-goo.fandom.com/wiki/Brush?oldid=6042" Categories: Article stubs Gameplay Community content is available under CC-BY-SA unless otherwise noted.