well, there is no direct way to tell system zones to make energy damage, but there are possible workarounds that could work well.
my proposal (some work involved, maybe hard for n00bs):
make a new solar
model: doesnt matter, invisible skin, no sur file, can be small.
custom AI that can drop mines at a very high rate.
custom mine launcher: zero safe time, detonation distance = expl radius = ~2500, only emp damage, refire rate up to 10 for example, zero energy needs, no ammo usage.
place it into a system, give it nomad reps, enjoy...
what u get is an invisible solar that drops instantly exploding mines that have a large radius (2500).
they only deal emp damage (they dont need any energy themselves so it wont hurt them).
the AI has to be carefully done (check mine dropping range and stuff).
all in all i see no point why this shouldnt work.
you can make seperate versions of the mine launchers to simulate increasing radiation when getting closer to the invisible object.
by scattering a couple of these in a field filled with toxic waste you could create a "radiation" field with variating intensity. could be a nice interesting detail of a system.
Fjord
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Excelcia Mod Leading Developer