Increase pain field damage and resilience by how many people it's damaging. So for a few people, it acts normally. For a massive rush of people dumped on it, the Pain Spire goes nuts and shreds them all, very quickly. Why? Because dunking bases isn't a fight. People claim to want fights, then proceed to just dump people onto them to end them as fast as possible. This simply forces people to stand off when they're killing a base, or enter a few at a time. Those fights (emphasis on fight) would go normally. But multiple galaxies full of AV dumped into a base would be much less effective. Or would have to drop NEAR the base, giving defense a larger chance.