In Heavensward, I was amazed at the definitions of it.

Heavensward, as a direction.
Heavens' Ward, as in the defenders of the Church.
Heavens' Ward, as in the final boss of Heavensward, Knights of the Round.

Now, I'm a little disappointed in Stormblood.

I was really hoping for an actual storm of blood like they kept predicting, but that never came. And Yoshi P mentioned how weather affected the mood of the game in battles like Susano. So I was really hoping for crimson rain.

Maybe we could see this in the upcoming Stormblood patches? I still don't quite understand what a "Stormblood" is, despite the rhyme.