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Destroyed Nuclear Tanks don't damage each other
Developed at the Propaganda Center, Isotope Stability is an upgrade available to Chinese general Tsing Shi Tao and his commanders. Due to the faction's use of atomic engines in their Battlemasters and Overlords (Nuclear Tanks), a small amount of radiation is left behind if the tanks are destroyed.
Isotope stability prevents the collateral damage from harming friendly units. It can be purchased for $2000.