User blog comment:AP Sejuani/LYCaN, the Advanced Prototype/@comment-26055105-20141101182757

I did a bit of math, and found that with a full AP build of Deathcap, Zhonya's, DFG, Mejai's, Nashor's, and Lich Bane, LYCaN's Rail Shot does a total of 5846 true damage over the 4 autoattacks to a target with 50 armor and magic resist. Most of that damage comes from the fact that the bonus penetration applies to on-hit effects (Nashor's and Lich Bane) as well. If you play a bit smarter, you can get 3 out of 4 Rail Shot autos to proc Lich Bane by using other abilities in between. In that case, you're dealing 12914 true damage over 4 autoattacks.

Balanced ability!

(P.S. I'm going to be completely reworking LYCaN soon to fit his lore more accurately. The new version is going to be a somewhat unique transform champion with 3 forms)