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Originally Posted by Volandum
Both hammer E and W do magic damage...
I build glass Jayce, but add in a PD after the LW, IE and Exec.
This is true, but W does more damage unless you're using E on a HP heavy individual or late game (at which point your E will be maxed either way.)
380 damage for a maxed W. 550 for a maxed E if the target has 2k hp. However, building Glass cannon or even somewhat AD, yes, E will be a better choice since the E does magic damage since it scales with your attack, very well.