I think it's time to revisit my Lux build now that I'm getting a better concept of defense and defensepen.
Grab CDR masteries and runes, as well as blue buff when possible.
Boots+pots -> Double rings -> CDR boots and Void Staff -> Dcap -> whatever.
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This isn't 1950. Girls develop way later than they used to because human lifespans have increased - Lavos_Fanboy