So, this doesn't have to be like hard, hard science, it just has to be close enough to science that you could plausibly say, “well, maybe with a lot more technological development, and if some of the conspiracy theories about secret science that the governments are supposedly suppressing turned out to actually be true, and if there were AGIs to design really advanced things, this could be maybe not totally impossible.”
So, in my universe, future transhumans have developed, what they call, telepsionics, or scalonics. It's based on the concept that dark energy (which in my universe is also the same thing as tachyons, which is also the same thing as the scalar waves that this guy called Thomas E. Bearden talks about, which is also a fifth fundamental force carried by a type of boson called a “scalon”) warps spacetime, such that it can be used to do things like levitate objects, move them around, rearrange molecules and atoms (anything larger than the scalons/dark energy waves themselves), so, basically, with enough energy and enough precision, do basically anything that magic could do.
It used to require gigantic machines the size of the LHC to convert enough electrical energy into dark/scalar energy to have much of an effect on the macroscale, but like computers, these machines were miniaturized; to the size of a building, the size of a desktop, the size of a smartphone, and eventually the size of a nanobot.
So now they put these things inside the bodies of transhumans (their bodies are more or less colonies of nanobots at this point, with a few cells here and there, for old times' sake, but even if those die, they can just assemble new ones later) that are basically like lasers or magnetrons, mentally controlled, which can blast out focused fields of dark/scalar energy. The power source is a wireless electromagnetic field that they beam out from big generator cores, though if they're not near that, they can recharge from power packs, solar, nuclear, antimatter, whatever kind of energy source they've got available. Eventually, ZPE/vacuum energy becomes the power source of choice.
So, my question is, basically, how do I present the system I've described in a way that it is 1) the most sort of generally scientifically-plausible-sounding (at least to people who are willing to accept that the laws of physics are discovered to be different in ways X, Y, and Z in this universe, but in ONLY ways X, Y, and Z—once I've explained what the laws of physics are now, they're immutable, like the real laws of physics) but also 2) the most powerful in terms of actually being a system of what is effectively magic, despite being described in a psionic/technological way?