Why I choosed that runes ? It's simple.. From AP's is good much and much AP, but Magic Penetration it's too not worst... For Sejuani I chose runes for be good on solo top line with gangs of powered Warwick.

This team is grounded to teamplay.. First go Sejuani, when all enemy go to her, rest of team go to support her ! When Sejuani do ult, Katarina have the best time for do her ult (that is ultimate combo), meanwhile Warwick and Caitlyn do extreme dmg to their AD and AP Carry. They can't escape...