Comet Ball

Comet Balls was a very popular brand of Kohlii Ball sold by Ahkmou, a Po-Matoran servant of Teridax's, in Po-Koro, but they were unknowingly infected with Makuta's darkness by Kraata. This caused every Po-Matoran who bought and played with one to fall ill. Almost all of Po-Koro fell to this illness, which Turaga Onewa called 'the Madness'. Takua, recently given the position of Chronicler, later found out the true purpose of the comet balls. Turaga Onewa was notified. Takua set out to find where the comet balls were coming from, only to find a Nui-Jaga in the cave he discovered that hid them. Toa Pohatu showed up to help. They battled and defeated the Nui-Jaga, collapsing the cave and ending the threat and production of Comet Balls.

Set Information
A comet ball was included with Toa Mata Pohatu. This had also been used in other Lego sets as a boulder.