I'm curious...I never actually played 1.XX, so I want to know if it's possible to summon a deity the same way you summon a primal. I noticed that when prayed to, primals appear...deities function the same way according to the End of an Era trailer. With everybody in Eorzea praying to them, they just decided to appear out of nowhere and give a hand. So, from the assumptions I'm basing off this, I have two questions.

Do you think it'd be possible to fight the deities in the future? Would somebody be crazy and summon one again, like Louisoix did? Also, would a summoner be able to bind the essence of a deity to them and use it like they use the primals? Is such a thing possible?!