The Toa Inika had to travel down the cord to get to Mahri Nui in pursuit of the Kanohi Ignika. They encountered the Zyglak and also had to defeat Vezon, who was pursuing them after being defeated by them soon before. The antidermis that made up Teridax also traveled down the cord, at one point taking over Toa Matoro's body while his spirit had left it through the power of his Kanohi Iden.