I mean, let's look at FFX's Penance. He is Yevons last way of stopping Yuna.
If Penance is that strong, can't it just blast away Sin over and over again?

What I'm saying is, to what extent to we see Super-bosses ability, and do they have an applicable backstory?

Omega, Shinryu, FF8 type Omega, Vercingetorix...

They have little to no story about them, they are just kinda there.

Is there any behind story to them?
Confusing way of stating it but it's late where I am.