Given that we saw Yuel dying like many times in XIII-2, I fully expect Lumina to be dead and brought back to life in some cruel torture ritual.

*Cut to Lumina dying*

*Half an hour later*

Lightning: Wait, is that Lumina again? I thought she was dead?

*Cut to Lumina dying*

*A few days later*

Lightning: What, hang on, she's alive again!

*Repeat this like four more times*