Sejuani is a very unrated Jungler.

She's a very strong late game Jungler and you can just jump into the whole enemy team like a r3tard.
Her ultimate can just win you the game if you use it well.

Welcome to my Guide!

Pros:

+ Very Strong Late Game
+ Tank whole Enemy Team
+ If fed you can't kill the pig

Cons:

- Slowly clearing Jungle till you get the Giant Belt
- Must have blue at early Game
- Need to be level 6 to gank perfectly

First you build Hunter's Machete.
After you got the Hunter's Machete you should build boots to be faster.
Then you go Giant Belt to have more Damage on your w and to get more substain.
I normally don't rush the warmogs, I prefer building Kindlegem for the cooldown and you also need it for the solari later.
After you got those items you need to build the warmogs and the solari.
Warmogs Armor:


Then you build the Spirit of the Ancient Golem.

If your enemy team is Ap Heavy you should build abysall Scepter and a runic bulwark to help your team.

IF your enemy team is Ad Heavy you should build a frozen heart to help your team with the passive and it also grants you more cooldowns+mana and ofc the armor.

If you completed your build your extremely strong and can help your team alot with your ult and your items.

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If you want to combo your w skill you can also build sunfire cape instead of frozen heart.
(I don't prefer this build but it's available)

You build tanky runes and movementspeed to have good gank options.
There's nothing else to say.
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You use Ghost, because of very good ganks and you have your Movementspeedrunes so you have + 35% Movementspeed in your masteries.

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You go 9/21/0 masteries, 9 in Offense, because you get the 35%+ movementspeed and the cooldowns+some magicpen, which will help you to deal some more damage to clear the jungle a little bit faster.

And ofcourse 21 on Defense to get the Smite Cd and the armor and some other defense statts to have more substain in the jungle.

An alternative is going 0/21/9, I don't prefer this one, because I want the 35%+ movementspeed.
If you go 0/21/9 you have longer buffs,which isn't necessary on sejuani, but you can go for it.

In my opinion Sejuani has one of the best Teamfight Ultimate's.
Her ultimate can just change the fight, you just use your ghost + q run at the whole enemy team by your own and use ur ult.
Your team just needs to focus down the fed enemy and the fight is pretty much over.
I've also tried some duo Q with a friend who played Leona.
Sejuani and Leona ult just takes the enemy team out of the fight for around 5seconds!!
We only tried this like 7 times and we won 7 times in a row, just because of the ults.
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All in all Sejuani isn't played that much, but is a really strong Champion.
If you know how to play her well you can win alot of games and get ouf elo hell easily.
Sejuani is also alot of fun to play ( in my opinion ).
I hope my guide will help you and you will have some nice games playing Sejuani :)
Thanks for reading this and feel free to share the guide to your friends.