

The Protagonist and Lindow manage to defeat the Corrosive Hannibal, but then the beast reappears in a much larger form and overwhelms them.

When entering Lindow's mind, he helps the Protagonist to reawaken Lindow's consciousness, and afterwards retakes his God Arc form to help Lindow fight the Corrosive Hannibal he had become. In the final scenes of the game, Ren urges the Protagonist to end Lindow's life whether it is because he feels pity or because it is in his nature is unknown. This explains such things as why only the Protagonist can see him (having absorbed the God Arc) and why he knows so much about Lindow. Ren was revealed to be Lindow's God Arc (personified). He seems to know a lot about Lindow, and can recount interactions between Lindow and the Protagonist on the field almost as if he was there. Ren first appears after the main storyline in God Eater Burst.
