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I'm with the no-shrinking camp. If they can't be repaired anyway, there's not really any reason for them to also slowly decrease in effectiveness over time, right? I also wish they would do something neat on death, like Martyrs, to make their death more of a neat event and less wasteful feeling. I don't know what would fit them though. Some kind of area defense buff that persists for a few minutes, or a ghost forcefield or something? Dunno.