Reflective shield which reflects all projectiles back at enemies so you can walk through the complex while hostiles murder themselves.
This idea is actually awesome. :p
Perhaps ALL projectiles is a little far fetched (which on this thread is a good thing). I'd imagine it as deflecting with an x% chance depending on it's tier with an associated energy cost per reflection. Possibly it could be limited to certain kinds of weapons as well, for instance only energy weapons or only kinetics. (deflecting missiles would be OP awesome!) I imagine it would also have only a small chance of deflecting directly back at the shooter (20% or something) and otherwise would act like a missed shot with them as target. So bullets would be ricocheting all over the place banging into machines and NCs and generally causing chaos (not a good idea with allies!).
So yeah, you failed, this idea is just too awesome for this forum thread.
OK, I guess I should think of a bad idea?
How about a portable fabricator? It takes 4 util slots and runs off matter in your inventory plus a f-ton of power and heat. You can wander the facility sucking up matter and giving birth to your very own swarmer army. If the going get's tough you can always overload it and vomit lightning for a few glorious turns before the whole thing fries itself. Pretty cool eh?