Sejuani will probably be part of the tank rework

please don't make her another generic CC bot with an hp scaling shield, we have enough of those

sejuani should trade strong defensive steroid for offensive scaling and higher than average damage than the rest of the tanks; the only thing she needs on this front is a more valuable passive, 25 armor is very meager. higher armor for more targets marked/duration they've been marked would be a good start.

make her W stronger in some capacity. it's fine as it is but i feel doesn't do enough damage even with the full duration of the W. personally i would like to see the enemy % damage be replaced with a strong base value that scales off of her own. i wouldn't mind if it was changed out of a standard AA reset if it bumped up the potential damage or the range she had. it should be her bread and butter like it is now. lower base -> higher scaling to give her more of a late game focus than other tanks have.

the only ability i feel really needs to change is her Q; she's on a big pig, i don't feel like she should feel fast or especially mobile. not quite as immobile as juggernauts, but not as much as she is now. in exchange give her some ways to make her feel more threatening when she catches someone and more comfortable to combat the enemy front line; currently she's only good for ulting the carries and can't fight other tanks very well because of her W's damage being cut in half in season 5.

E is a boring spell, but it holds her kit together very nicely and is important to her identity as the tank with endless slows. not really any complaints here, the best I can come up with is some sort of stack system where you can cultivate the slow and the damage by sitting on them with W, or choosing to pop it early to catch up to them if they burn a dash or something. I'd prefer riot to leave it alone

giving her some sort of special AAs or an ability where bristle gores someone would be nice, too. i think the fact she's on a mount isn't played up enough and there's definitely room to improve on this

tl;dr make her better at fighting but less mobile. don't give her a shield or a heal or any of that shit, tanks are homogeneous enough. she should be the sort of tank/juggernaut in-between.