Thought it would End Differently
Just saw it a few weeks ago, and I had a little problem with Eris' Plan:
She asked Sinbad to steal the Book, in return for his life.
Sinbad agrees to steal the book
Eris steals the Book herself (?!)
Blames it on Sinbad to take the blame, which endangers his life.
Sinbad's friend gives his own head as collateral, endangering the kingdom.
Then as she planned, Sinbad sails for tartarus so he could get the book back.
Eris plans for him to never return, so that the kingdom would crumble without the prince.
but that's problematic because:
1) Eris is a goddess. why manipulate events that would chop the king-to-be, when she could just kill off the prince with some monsters?
2) Eris is a goddess. why manipulate an arab-greek-hybrid to steal her book, when she can take it herself?
3) Besides, if she planned taking it herself all along, why make sinbad believe he should steal it, when he can fail and get captured doing it, making it harder for her to get the book once the guarding would triple?
I know all questions can be easily answered with multiple theories that mean squat since this movie is meant to be simple, casual and ain't about complication.
BUT... I had a theory brewing while I was watching it.
After Eris steals the book from it's temple, Sinbad is charged with theft, and sets sail for tartarus where he can get the book back...
Eventually his ship would reach the ends of the earth, float in the air above...something.... and enter into the Tartarus-portal with his ship.
Once the Ship is in tartarus, he would challenge Eris and try and force her to give the book back. Eris would then happily point out "I was the one who asked you to deliver the book to me. why would I ask you that If I could just waltz in and take it myself?"
Then she would hover over to Sinbad's ship, and life a plank from it's side, to reveal the book was hidden inside the ship all along. (dum dum DUUUM!)
Eris asked him to bring it, but he didn't have to know when he's doing it, only to have him agree to it.
and above all, she couldn't bring the book into Tartarus herself (the book rejects the portal in the hands of the gods. only humans can bring it in)
That sounds like a much better plan, including the fact that she tried to sink the vessel so that the ship would eventually plunge into Tartarus Chaos in the bottom of the sea (if I understand the cosmology correctly)