User blog comment:YourPrivateNightmare/Sejuani, the story, the problem, and the possible solution/@comment-24674556-20141104230728/@comment-5077844-20141105082210

As I've come to realize, my own suggestions went a bit over the top, as the only thing Sejuani realöly needs is a fix for her early game, rather than addiotional lategame power.

You kinda do the same. %damage reduction on basic attacks on a champ who already has teh ability to singlehandedly take out ADCs if she gets to them.

I'd say, if it was a flat amount, something that would be particularly strong early games...along the lines of Ammumu's E, then I see potential...but % reduction is a little bit too much, even if she's supposed to be a strong tank.