Unmarked spoilers below.

Was it ever explained in the story how Meteion obtained her abilities to wipe out everything? Or she actually was a weapon of mass destruction in disguise from the moment she was created?

I mean, from our time in Elpis we learned that Meteion is an entelechy and their abilities are basically feeling emotions of people around and being emphatic to them (which was covered in her report where she said her sisters came in contact with denizens of a star), mind reading and ability for a telephatic connection. These all sound quite harmless to me. So did they just carelessly shoved ability to cause havoc and catalcysm on a planetary scale to the pool if her skills?

I don't remember them explaining it, like what, emotions and wishes of people around empowers her and her sisters so much that she gains ability to "satisfy" them by bringing down calamities capable of wiping the whole universe? Like, woah, Hermes, you massively screwed up. Does it really work from writing perspective to give your antagonists such abilities without properly explaining them firstly?

And then it makes me wondering, what if there were no despair, fear and suffering and only joy. Would Meteion then ascend to the edge of the universe to sing "Song of Happiness" instead? If these emotions make her THAT powerful.

I really missed out on that part.