In this post, Beren Millidge argues that intergalactic warfare between mature Kardashev Type Three civilizations would probably be strongly defense-dominant. Although galaxy-scale attackers could use devastating beam weapons, relativistic kill vehicles, and self-replicating invasion probes, the sheer distances involved create enormous targeting delays, warning times, and energy costs. A sufficiently paranoid defender could survive by spreading out, staying mobile, building redundant infrastructure, and using vast sensor and laser networks, making conquest ruinously expensive and usually irrational.

https://www.beren.io/2025-11-22-Space-Warfare-Seems-Mostly-Defense-Dominant

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