The Matoran Resistance Against the Crumaki (MRAC) was a group of Matoran created solely to keep the Crumaki from killing the Av-Matoran Iymouvu, Daruka, and Nikkau, as well as the Fe-Matoran Tamari and Feyeh. They built a fortress in the Cordak Desert to be their base. Each Ruku had its own mini-base. These are currently abandoned and out of use.