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Yikes. It needs to cost power, elsewise someone trying to meld is going to find someone truegrounding against them for 0p a losing prospect.
Okay imagine if you will. Maligorn is melding for you guys and he makes everything his terrain. We don't have a melder but we kill him which breaks his entire meld. We can then rush to trueground the area (costing no power) so when he comes back, he has to re-terrain everything costing time and power.