Magic pen or Armor pen Jax?
There was a thread like this somewhere and that's what Phreak recommended, anyway. I don't personally play him.
Hugs From Momma
Jax is about 75% physical damage now, so armor pen.
Q, E, Autoattacks and Sheen procs - physical.
W and R - Magic damage.
Even messing around on AP Jax armor pen was more useful - tho I was mostly abusing lichbane + W for some hilarious burst.
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