I guess you haven't watched the series before.....
...Because its already been proven that only Divine weapons or Gods are capable of harming Aku.
Re-watch the series and you will see that I am telling the truth.
Aku cannot defeat the Minions of Set, only another god can do so.
And the weapons of the Minions of Set are divine, just as they are divine.
Aku has no way of defeating them.
the final season already proved that the Gods don't like Aku.
I am not sure what more proof you need, but all the points have been confirmed and proven.