There's a lot I don't understand here. You neglect to explain why your runes and masteries are the best on her. You spend far too much time praising Sejuani as a champion without showing us how to carry with your build. A match-up section doesn't exist, so I have idea why I'd want to pick her.

My honesty might hurt, but it looks like you spent almost no time writing this guide, even less time considering how to write for your audience. Not everyone will understand Sejuani like you do. I feel more confused at the end of your guide than I did at the beginning, which is never a good sign.

I think you should spend more time to dig deeper into what you do with Sejuani to carry with this build. Really explore how you win games. Remember how you mentioned that Flail of the Northern Winds resets her auto-attack animation? Try to flesh out your guide with more information like that!

Scaling life runes could be better I think. Remember that sunfire doesnt stack with the green gem jungler item. Even vs Full Ad team you can armor boots, Randuin, Thormail, warmog, iceborn, rylai =~ +255 armor, +1700*1.25 hp

Those runes are a joke i hope... same goes for the masteries... Did you even play Sejuani to know she dosent need LIFESTEAL??????? ATTACKSPEED? You really dont seem to understand this champ at all.