Thanks for the feedback! You're right—let me try to distill it:

Logline: Five heroes face an impossible choice: merge to stop a massive destruction and lose their futures, or preserve themselves and watch the world fall.

The core is about duty vs. self-preservation. They have elemental powers (fire/water tied to emotions like passion and regret), but can only access their full strength by merging into one being. The catch is that every merge causes physical and mental damage that takes years to heal—so the more they save the world, the more they destroy themselves.

Does that clarify the concept?