...The strain of the Rainbow Virus that made me possible is the same one that allowed those genetic experiments to continue. It is capable of burning a body down to its barest components, rotting their cellular structure, and then using the shell of what's left to rebuild again. Like melting down iron and turning it into a sword.

[ it's easier to explain that information clinically and scientifically, at least, though lu bixing's cloudy expression hasn't changed. ]

...It is only through using strains of the virus to rebuild that any sort of genetic transfer was remotely successful. And it came at an impossible cause of pain and suffering to others with very rare success. You would have to be, quite literally, brought nearly to the point of death and then reconstructed, piece by painful piece, and every second that the Rainbow Virus existed could be a second that it leaks out of a lab and destroyed an entire galaxy.