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UBs were a terrifying take on invasive species, and Aether was right to make type: null as a form of bio control.
Take Celesteela for example.
>Celesteela's anime episode initially portrays it as a cute princess Kaguya story of it growing up and flying away in Sophocles' retelling.
>Even then it was pulling some The Colour Out of Space shit with the lonely old couple taking care of it.
>It also kills all the crops in the story, thus causing an angry mob to form around it before it takes off.
>Later on Lusamine's computer mockup shows that it wasn't cute and small when it landed, and it likely crushed everything beneath its steel body when it fell out of the wormhole.
>It has also been laying dormant underground for 200 years.
>It has also been building up flammable gas in the ground, killing surrounding plant life and building up to a possible catastrophe.
>Lusamine states that it'll likely torch everyone in the surrounding area when it decides to take off.
>Can make it to other planets or continents easily to reproduce like a weed.
>Shows little to no emotion unlike even other UBs. It just shows a preference toward moonlight, which it's likely feeding on.