Let me know when you find the person that said perching's sole purpose is to spike. What tracers do is effectively limit the lerk, tracers take away an option. That is perching in combat. That being said tracers affect marine's ability to aim or 'track' the lerk. I don't see how you can say they don't, they cause a lot of visual clutter. Tracers are training wheels for marines who can't find a lerk, AND they also give lerk's an unfair advantage at range because they cause so much visual clutter.
make shifts a structure to be built (like ips) near hives (i.e., shade/crag), unless you brew up a shift hive.
then let is build where ever you have festering.
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then let is build where ever you have festering.