Integration

[Balgus82]

Mumm-Ra needs to get the other stones. Lion-O can already kick his butt with just two of them. The balance needs to be restored. He'll need one for the Sword of Plun-darr and he'll need a second to create his armor to counter Lion-O's.

I was really hoping he'd get the stone in episode 13. But I suppose the "spirit" stone might not be the most threatening of the stones. Maybe it's the least powerful and that could be why Lion-O could only manifest one arm of his armor.