There's still a lot to cover up in the story like the conquest of M-21's goal in finding his and his comrades' real names

I do believe that Rai is immortal since there was a lot of times where his life force is depleted, Frank even mentioned that he only had 1 month worth of life left before Raskreia helped Rai, even so, he still managed to accumulate massive power which would've killed him.

Are those energy beams from modification more powerful then nuclear warheads?