The Onu-Matoran dig stuff.

In fact, the Onu-Matoran were created in order to dig stuff up for other people. After hundreds of years of digging up stuff for other people, they staged a rebellion and began digging stuff up for themselves.

When an Onu-Matoran dies, its friends and family will bury him, then dig him back up again, because Matoran can't die.

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