i may have said 7 galaxies, but it wouldnt be banned in this one
for stealth feilds it could be something like a "shimmerfeild", where most particles, inbound or outbound, are shifted into another reality by using a particular energy wavelength that inverts the strings in quarks, thus never reaching the scanners of another vessel
for defence hows about a "reality fader", fading the ship in and out of reality alltogether, at the quantam level by temporarily moving particles into another reality,
sheilding, mabe a "particle imploder", that implodes the quantam particles of any kind, essentialy deleating incomming projectiles from space and time.
for energy perhaps a string chamber, splitting strings in a controlled way, releasing pure and raw energy
so what about that for another tech level?