Noxxy’s physiology has been significantly altered even by the standards of the artificial alicorns of the Unity. She possesses an uncanny ability to absorb and neutralise thaumatically radioactive materials and arcanochemical residues, far beyond what her sisters are capable of. In a way, she can almost be seen as portable small scale Gardens of Equestria. Of course she is not going to be able to just go and clean up the entire planet, but if you need to get some contaminated wartime facility cleaned up in a hurry, just toss Noxxy in there and watch her soak up all the nasty contaminants in the matter of hours. Then just wait a few more hours for her to process and properly absorb all that stuff and get mobile again, and the facility is ripe for salvaging!

Oooor maybe Noxxy is just trying to evolve into the Goddess II.

Just a silly idea I got the other day. Noxxy the toxic waste sponge! Why are alicorns seemingly working together with the Grand Pegasus Enclave (or maybe the Enclave Remnant)? No clue. Perhaps they threw their lot in together after the Day of Sunshine and Rainbows.