The Rumbling. A catastrophic event capable of mass extinction consisting of 585,000 fifty to sixty meter tall Colossal Titan's that emerged from the three Walls of Paradis, Wall Maria, Wall Rose, and Wall Sina. The Colossal Titan's are completely mindless and apathetic and unable to speak or think, all they do is follow the will of the Founder, which is now Eren Yeager. The Colossal's also move at around 50 kilometres per hour.