I wonder if that's what happens if you do something really stupid and try corrupting Wistala
Ok I'm going level with you I was just going to make this one sentence and then this turned into a ramble so enjoy.
If you think about it the Wistala might already be fully controlled by her metal or be in some agreement with it as she said all her kind only wants the metals dead and there users dead aswell and she only keeps you around because your metal seem at half power and not a threat yet. Also her metal or her might not want competition for corruption or new threats to pop up and now that I think about it she might only want the bird as a pawn to only kill other metals that dont have hosts yet and not to save the world, as if we can believe our metal there not really that conscious until they find a host that they can attach to gain knowledge of the world. Also I know the metals have really good powers but I don't think what caused worlds to "merge" as Humanity would been more fucked if a metal user pop up with that level of power and not a 100 years war, unless that metal user was Wistala that waited until her kind were desperate and moved in became the war hero to hide in plain sight. also every time Lilly in the same room with Wistala she just feels fear and if Wistala was not a war hero I think her own kind would kill her on sight do to the subconscious fear of the metals. Also I think Wistala might have only stop the war because she realize humans are perfect hosts for metals and with the worlds being merged and the metals having fled into earth on the humans side, its only a matter time before humans start using the metals and humans dont have senses to feel the metals so they don't have the subconscious fear of them. so her kind and herself are fucked if Humanity get 3 or 4 metal user at high power levels as Humanity would just wipe them out then. so then when Wistala stops the war she literally get near world domination levels power of within was like 3 or 4 YEARS and has the world largest Security Services using Humanity as meatshields to keep her safe from her own kind and I think she was only keeping tabs on future metal users because she cant kill the metals yet and killing there future host makes her have track down the metal again with its new future host and death seems to cause the binding prosses so it kinda dangerous to kill the hosts as if metal has ability to escape with its new host it could big threat to her so she only kills fully binded hosts to force metals to find a new body.