Someone should write a fic where everything Kronii touches dies. Maybe it's a side effect of being Time itself, like she causes everything to rapidly age and crumble into dust. This gives her her doomer personality, as she can only watch, immortal, as everything and everyone she gets close to accelerates to it's inevitable end. This is why she prefers big underground structures like the Bunkeronii and why she tries to keep them hidden. It's a precautionary safety measure, to keep others out and away from her. She's like a poison, and she knows it, she doesn't want to hurt those closest to her and so she keeps them far away.

Eventually Fauna rescues her since Nature is in a constant state of Death and Rebirth and Fauna herself is immortal.