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Alicade Tredecima, the Thirteenth Creation of the Fourth Sage, Alicade of Carmine. In terms of physical strength, she is capable of tearing apart steel plates and puncturing them with her fists, but her real power lies in her sheer arcanic knowledge, which in her setting is more akin to temporary reality warping where they have to justify the existence of their magical constructs by basically tricking reality for a while.
While she does appear human, she is anything but. Her bodies are completelty restructured from the ground up as general purpose mobile spellcasting platforms (though she has specialized platforms for specific purposes), and each and every one of her bodies are connected together through a hivemind, with the gestalt mind existing in a higher plane of existence above reality allowing for seamless and instantaneous communication across the infinitely sized world (think minecraft but infinite in the x, y, and z dimensions.)
>How strong is your OC?
Pretty strong, though it's mostly because of the hax that is her setting's way of using magic.
>Do they low dif Goku?
I don't see a low diff. Theoretically, she could target him from an arbitrary distance and hit him with conceptual flame (which induces the effect of burning but without existing in reality, so it can't be put out by regular means and it will burn anything regardless of whether or not it's even flammable, like fire or empty space), but in a straight fight Goku can just obliterate her. Granted, it'd be difficult to get rid of her because of how many bodies she possess (not to mention she can infect and convert him into one of herself), but yeah its not something Goku can't beat.
>Can they blow up a universe?
Theoretically, but that requires so much energy that while the spell itself wouldn't be computationally complex, it's so utterly impractical and she'd be unable to achieve it without at least possessing a Godshard to manipulate Creation directly without it refuting her spell instantly.