User blog comment:YourPrivateNightmare/Sejuani, the story, the problem, and the possible solution/@comment-24057740-20141105114956

Sejuani was realy overloaded when released. She build fulltank and dealt more dmg as the normal bruiser did. This + her brutal CC made her overpowered. But she was hold back by her realy weak early game.

The with the rework, they gave her the new Q and a passive the does something (10% slow was realy weak as passive). Her old w dealt only full damage when the target was frozen, and outside of her Q and your autos you don't freeze your targets. This made an awful clear in the jungle and they fixed this, by changing her W (AA reset increased her clearspeed further). Suddenly Sejuani was hot. Pick or ban status. She did thngs bether than other tanks, and scaled as good as other damage jungler, while buidling tanky. Her weak early didn't hold her back anymore and she could start to shine.

When Sejuani got changed, tank jungler were the go to (or Bruiser that built fulltank). So she felt even more powerfull.

Riot did what they had done often during this time and overnerfed her in 1 single patch. The SoloQ metasheeps forget her and since then she had no relevanz. In my opinion they overdid the nerf. They gutted their scaling on W + nerfed her cc tools. Just give back the early duration on her E would be fine. And give her a qol buff to her passive, so it activates on taking damage to. Her lategame (when you reach this point) is still crazy strong, but it sucks to be a tank but you can't tank without items.