Once again, the Great Beings experimented to repopulate Spherus Magna. Now that only an alternate Teridax and Miserix were the only two Makuta left in the universe, the Great Beings began to create Rahi on their own.
Mergumus Elephants were one of their experiments. Though these elephants were rather small and looked innocent, they were quite deadly. In order for the elephants to protect themselves, the Great Beings granted them a power tied to the Reconstitute at Random Kanoka Disk, which was channeled through their trunks (this sample was shown with a mace, though other weapons could spawn as well: drills, swords, blasters, etc.).
Mergumus' also had a deadly poison that ciuld kill any being not in contact with the power of Arsenic (which is why As-Matoran like to keep Mergumus' as guard Rahi). Though the poison can weaken a person from a distance, it will only kill them once impaled by the Elephants' trunk.
Now, the Mergumus Elephants wander the wastelands of Spherus Magna.