[clark]

What about modding the system shield to reduce system happiness, system intel, research, organics, rads, minerals, and if possible, production.

You'll have to think long and hard about using one of those, no?

How about it increases the chance of bad events in the system? (you are afterall playing with powers you can barely comprehend...muhahaha)

Or, it needs the power of the sun, so it's either sphereworld, or system shield?

Can you give facilities a maintenance cost? If so, make it a killer so that you can afford them for only a couple systems...