Kay this is my first guide. I write it because I think Sejuani is underestimated at the moment. People often want champs with whom they can dominate the game. If you´re looking for such a champ, you´re wrong here.
But if you´re looking for a champ that can jungle, has ganks like hell, TONS of CC, tankyness like no good, deadly initiations and can support your team than Sejuani is the correct champ.

I wont explain her abilities etc. in this guide. If you want to know how they work, go look here.

I apologize for any spelling or grammar mistakes, English is not my native language.

The Runes...as you can see above I choose to take gold per 5 quints just like Phreak. You´re running around with Philo-Stone and Heart of Gold a huge part of the game + Quints, thats results in a nice steady income and you´re full equiped at about min ~40.

Armor seals for jungling and additional armour throughout the game, nothing more to say.

Flat CD reduction Glyphs! You have cooldowns that are so high you could make some coffee, while you wait for them to come off CD. Absolute must!

Marks... well these are giving me the creeps...I admit i don really know what fits in there.I took ATK speed runes to clear the jungle faster. If you find something that fits better, feel free to replace them with something else.

Defensive Tree:
Enlightenment for additional lategame CDR and Mercenary for additional gold. You will mostly rack up assists and no kills.

Utility Tree:
Again: gold per 5... A little math: with quints, masteries, standard income and items you have a gold income of about 15 gold per 5 secs. 15*12=180 gold per min. Lets assume you have Philo-Stone and Heart of Gold on you for at least 20 mins. 180*20= 3600
WITHOUT farm!

Runic Affinity simply because you´re jungling, Swiftness because you´re slowwwwwwwwwwwwww.

Smite! You´re jungling -> Smite! No discussion.

Heal:
Well this one is my favourite, because it can turn the tide of a TF and thats what this champ revolves around.

Flash would be another candidate, BUT you are the tank plus a little support in this guide and your FKING FIRST priority is to secure the life of your team´s carry. For that porpouse heal is much more useful than Flash. 650 HP (590HP + 10% Masteries Buff) may not be much for Sejuani in lategame, but for your carry it can be 1/3 of his total health.

=> Heal > Flash

Everything else is **** on Sejunai.

Okay you want to go jungling with Sejuani!
Level her W first. Then follow with Q and take E at level 3. Max it out first, because this is your tool of choice for deadly ganks.

Max your Q second. Levelling this spell up reduces it´s CD and thats exactly what we need for the porpouse of frequent ganks, escaping through walls, chasing enemys etc.

Of course level your ult whenever possible.

General Order:

R > E > Q > W

Play Video Here you can see how to jungle with her. I usually start with Blue, but you can handle that like you want, just let someone pull the Blue for you. Makes the jungle a lot safer.

My personal jungle route: Blue -> Wolves -> Gank or Wraiths -> Golems -> Red -> Wraiths -> Wolves. After that you´re pretty low and should go back to base. Buy Philo-Stone and Boots if you can afford them and go look for a gank.

What I love about her is her ability to wipe out an entire creep wave with 1 combo.

Wait for the creeps to rack up in a mob, charge in with your Q. Frost is now on all creeps you hit. Your W should be activated while you charge in. Cast your E Skill within the 3 sec intervall of Frost applied by your Q spell. After that about 90% of the creepwave should b down.

As i mentioned already: your first priority is to secure the life of your carrys. For that make sure to CC everything that makes the slightest move towards your carrys. You can slow them down almost to zero, so your carrys can get out of the danger zone quite easy.

Teamfights:
You can innitiate two ways: with your Q and with your ult. Both are great initiation tools even when used alone. But the best way is to throw your ult into the enemy team when they´re quite close to each other. You charge in with your Q then. After the stun of your ult is gone you cast your E skill. When there are still enemys left you activate your Randuins Omen. Of course your W should be on all the time.

2 (1 sec) stun + 3 sec 70% slow + 3,5 secs 35% slow makes nearly 9 secs of CC. Should be enough time for your team to wipe out at least 2 enemys without having to fear enemys suddenly appearing in front of them. Well that means if an enemy doesn´t flash into your team.

Kay the items. The build I made gives a lot of HP and roundabout 200 MR and armour. Additionally you support your team with the active of Shurelias to chase enemys, charge into TF or escape after a TF went bad. Randuins Omen makes AD carrys a lot less dangerous. Aegis of Legion is a great item in every way.

Just follow the build order above and you should be fine.

Sooo...first guide is ready now. I know a bunch of people will say what i wrote is ****. Well haters gonna hate, thats how it is. I just wrote this guide, because i don´t want Sejuani to become an underplayed champ like Karma is. Both great champs but most people don´t know what they´re capable of. Too bad. Either way, I hope some of you use this guide to become a great Sejuani player.
Good night!