I recently stumbled across this, an old quote from Bungie's original Myth page, as recorded by Hamish Sinclair on the 15th of September in 1997:
"The myth of the story centers around a deity which appears in this world in cycles of a thousand years. During one cycle the deity will appear as a Savior; in the next, as a Destroyer. At the beginning of Myth, he has returned in the guise of Destroyer, with the Fallen Lords, a group of resurrected and powerful generals. These beings and their legions of undead and spirit forces rise up to destroy the living beings of this world, while the player controls the living and tries to stop the onslaught. "
So, the diety alternately returned as savior or destroyer, eh? I guess I was right about the Leveller back in the day, then; their original intent WAS for him to be a level-the-playing-field type of Leveller, not a level-their-armies-and-salt-the-earth type of Leveller. Of course, now this is all changed. They originally intended a 500-year Era too. Oh, sloppy, sloppy Bungie...