White Zetsu army is a heavily attack force which is created with genetically modified White Zetsu clones. Each soldier can drain chakra from enemies and can steel their appearance and all other attributes for a while. And also all of them are doesn't need sleep, eat or breath. Obito & Madara builded this army and Kabuto Yakushi modified at the end which is granted 100.000 White Zetsu for them.