While Star Wars has god like characters, Halo has its own gods. The precursors basically thought things into existence and created [i]universes[/i] not just galaxies. You can't kill a precursor and even if they allowed you to they would be reborn as a young precursor again. Your "wave of the hand instadeath" is nothing against thinking them out of existence or thinking them into a universe where the natural laws of this world are twisted and broken. You say "well they have the force." The precursors [b][i]are[/i][/b] the force.