This is how I play her. Probably not how other people are.
For runes you can go standard tank runes.

In my opinion Sejuani is one of the best tanks. Shes FULL tank shes not a tanky/dps champ Shes made to be full tank.

Sejuani is great because of all her CC (slow, stun etc) and her dash.
The way I engage in combat. I start out Dashing into the enemy and popping my W after that i aim with my ulty to make sure i stun their whole team. when the stun runs off, and they start to run away i use my perm frost to slow them down completly.

You can change the order on the items after the 1st warmog depending on your stitoraion.
If they got some strong ADs buy the chain vest firs and so on.
If you want to you can buy some thing else insted of the 2nd warmog. (guardian angle) (andium Omen) (sunfire cape) what ever you want.. Just remember DONT buy AP.
The reason i use 2 warmogs is simply because she gets invinsible in team fights.

Summoner spells:
Flash: Getting low on HP and need to escape quckly or catch up on a enemy.
Heal: She got no ability to help herself really, she cant heal or shield herself so i find this a nice spell to pick up on her.
If you dont like Heal or flash i would recomend Exhaust/ghost

I hope thise guide helped you!


Ingame name: Tensess