Talk:Void Staff/@comment-89.154.190.184-20120123040051

Assuming you're using a champion with the Arcane Knowledge mastery, 9 marks of insight and sorceror's shoes:

You have 20 + 9*0.95 = 28.55 flat MPen and 10% remaining MPen

So when will this pay off more than an Abyssal Scepter? Assuming the Scepter is the only source of MRes reduction, it's the equivalent of an extra 20 flat MPen.

(X - 48.55) * 0.9 > (X - 28.55) * 0.54 X > 78.55

3 opponents with Negatron Cloak-based items. Easy enough to remember.