In lore Rockwell used pure/unstable element in himself and became a mindless tentacle monster, and killed a bunch of people
In that original tentacle monster form, Rockwell wasn't looking anything like a human at all, it was more like an eldritch god as those by H.P Lovecraft (Perhaps is something this what element originally came from? Lol) i wish i could share a pic of it like that here, he became vaguely more human-like once he mixed himself with the overseer of aberration and turned into the boss we see in it
Now... that was unstable/pure element, idk what average element (the blue one, which is the one that we give to ferox, and that is more stable/less pure) would do, but it would prolly still do something like that, becoming like a raging monster, perhaps not so mindless/mindcontrolled? (Idk, we prolly have a better metabolism than good old man rockwell, and with it not being pure the effect wouldn't be as crazy, but we still prolly don't have metabolism as good as ferox, which is adapted to do that
That all is, i am assuming humans can even metabolize that in any way, and so we prolly would do that better than if we were old, but it could be that only ferox can actually do that properly, since it is the only one we get to see doing it, idk)
Idk lol, but it would be crazy, one prolly would get a lot of kills...
Someone can prolly make a nice mod on that