Okay, so I read everyone if you complete the Stallatio Quest, gain Cinna's Hamer from Hades and keep it in your equipment, you get an alternate ending.

My question here is, is the whole ending changed, are there some extra parts added. What exacle does it do? Cause I wanna see the ending, but I don't know if have to complete the game two or one time to see everything!

And no spoilers please, I want to keep it a suprise