Talk:Xerath/@comment-88.186.19.90-20120707002044/@comment-108.172.242.96-20120707224057

Very, very approximate, but in terms of raw damage at level 18 the extra 22% pen from Void Staff is worth about ((AP*0.66)+260)*(EnemyMR/100*0.22) AP

So, if you have 350 AP and are nuking someone with 70 MR, the extra 22% pen is worth about: ((350*0.66)+260)*(70/100*0.22) = 491*0.154 = ~75 AP If they had 200 MR instead, it'd be worth about: ((350*0.66)+260)*(200/100*0.22) = 491*0.44 = ~216 AP If they only had 30 MR, then it's not so great: ((350*0.66)+260)*(30/100*0.22) = 491*0.066 = ~32 AP

If you have your survivability items and Deathcap already and all you care about is making the other team dead, Void Staff can still be well worth it even if you never nuke without being in W-mode.

Xerath still sucks though.

Notes: EnemyMR is their MR value after flat reductions and flat pen. Also, AP*0.66 and 260 in the first part of the equation are just averages of the AP ratios and flat damage of the 3 damaging abilities (and only 1 hit from Ult) with no consideration for frequency of use etc.