...Transmigration is the exchanging of souls between two bodies in separate worlds. There is one who initiates the process and one who is a victim to it.

It can also just mean someone being taken from one world and put into another.

[ It doesn't escape Cale's keen eyes that Lex seems to be experiencing some level of distress. He frowns faintly. ]

...Hey. You've done a good job of surviving, Lex.