If this is possible it could make Defenses alot more longer

Because when all levels are done you can make them upgrade their defense and resend them

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I was thinking about this and how to overcome it..it's actually incredibly simple. all you have to do is start with level 1 at ..say 1% hp and it increases over time. with starforge, the hp limit is ... VERY high so it could even at full upgrades, one 100% unit could be pretty powerful. and if that wasn't enough, you could even add shields in with the protoss units to 'double' the hp.