User blog comment:EpicElijah/The Stone Army and the FSM/@comment-33842457-20160311212114/@comment-27747281-20160311213654

They could've possibly had a hand in helping against the Overlord, but we don't really know for sure. The original Elemental Alliance came into being at least some years before the first Serpentine War began (hence the age-appearance of some of them), which I believe took place some time after the Stone Wars.

Also, I think the reason why he made Elemental Blades fashioned after four elements was because they corresponded with the Golden Weapons.