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Quantities do exist in nature, outside of our concepts though. if there exist two electrons in a given area of space vs only one electron in a differen equivalent area of space, the implications of that on everything interacting with them would exist regardless of if we had a word for what two was.

That aside though, I think that what you have just said confirms what I am trying to say, because you yourself state that ethics are based on axioms. The thing about axioms is that they are not proven, they are statements simply assumed to be true from which all else follows. Mathematics is similarly founded to my understanding, but mathematics can also be compared to measured reality to confirm if the system derived from a certain set of axioms describes that reality (for example, euclidian geometry follows logically from a set of axioms, but since the discovery of relativity seems to show that physical space does not always perfectly follow euclidian geometry, it can be shown by observation of the physical universe that this mathematical model doesn't completely fit reality. It's still useful of course, and it does still logically follow from it's axioms- but those axioms can be verified as fitting observable reality or not, it isn't arbitrary if you accept those axioms, if you're talking about our universe that is. But ethical axioms are a different matter. Sure, you can have an objective ethical system, based on a set of ethical axioms, but to do this you have to accept that particular set of axioms in the first place. If one was to use a different set of axioms, you'd get different ethics.

Suppose we were to meet some aliens- intelligent and technologically sophisticated aliens, in the same way and degree that we are. They'd probably posses ethics of some kind (since ethics are ultimately a tool for deciding what one should and should not do, and the aliens should need to make such decisions just as we do). They'd also probably posses mathematics, since they're using science and technology. It might not look like our mathematics, having different symbols and phrasing and ways to manipulate those symbols, but it should have roughly equivalent concepts, since they're using it to model the same universe as us. We can assume with reasonable certainly that the axioms used by their mathematics when describing reality will translate to be the same as ours, assuming we both take the measurements needed to confirm if our models fit, there's not room for them to take arbitrarily different axioms here, because if they do, their results just won't be useful except as a mathematical curiosity. However, there's no particular reason that I can see to assume they have to accept equivalent ethical axioms to us (if you can think of a reason to assume that they do have to arrive at the same ones, I'd be interested in hearing it). If they can create a completely different set of ethics starting with different axioms, and don't run into any contradiction with observed reality in using that different model, that would seem to imply that the choice of which axioms to use is ultimately arbitrary, and that we can just choose whatever set of them results in an ethical system that we happen to like.