There is things to improve, I won't say a lot since I'm not a pro jungler :

_Explain how you jungle, where you go and how you do it.
_Your typical standard build is not good, what are you gonna do with only 60 MR ? You need to get a Bulwark and change your boots and the end for mercuries instead of mobility or ninja's tabi
_Since you initiate, you can take the enchantment for boots which grants MS to your friend when they move to you, it's really helpfull in teamfights
_There is a lot of items in this game, so I think you can speak about other items that you didn't speak about like Lyandry for example

I won't vote it, I prefer to wait to see if you are gonna to follow the feedback and if you'll improve or not, good luck ;)

I see what you're saying, but compared to other junglers, If I can't gank before 6, then I feel like I'm a slow clearer since other junglers can clear faster than Sejuani and possibly get first blood at level 3 already.
I would get mobility boots to get from lane to lane faster, but most of the time, I find myself having to tank more than usual during the actual fights once I get in there and having to do damage.
The Spirit Visage was just there because I couldn't think of any other item that has mag resist and hp.
Again, I just feel I need to be in the fight doing damage and tanking hence the sacrifice of mobility for tankiness

I gotta say, I had to downvote. This isn't horrible but it's not optimal. You made a great first guide. Don't stop making guides. However there are a lot of critical errors in here and I want to state my opinion on them. Take my opinion as such but I main Sej jungle so I have many games of trial and error behind me. thanks for posting

"- Slow clear time compared to other junglers
Slow to start, yes. I do agree there, however once you get all 3 of your abilities you move quick. Charge, flail, and burn with E and you're almost done. I'd say slow till lvl 5-6
- Can get counter-jungled easily
I disagree but this is the shared opinion
- Your team will depend on you to be God
You will be either way, sejuani is OP at the moment.
- She isn't Lee Sin, Hecarim, Nautlius, or Zac
No she's sej, which is just as scary right now, check her win rate.
- Her new artwork sucks IMO"
Opinion lol love it.


Spirit Vis - Why? ...Not sure what else to add here. It has MR on it but you can get that from something more realistic, that doesn't beat Warmogs imo even looking for MR. You can get what you need elsewhere.

Ninja Boots - I need to ask why these would be a "typical" end-game boot. You should really be going after swiftness. The constant speed boost on sej is OP and Ninja is really only good against fed ADC or other AD chars that are fed. Even then, Thorn works well. These should be situational boots.


Your other sections look good, the only thing I'd say is that the primary enchant really should be the Champion Enchant. The move speed boost for your team is amazing. Since you're Sejuani you should be starting fights. Your utility almost demands you start the fights. Since that's the case, having everyone move to you quicker after the engage only makes sense. They others are good too but overall that's a lot better.

MASTERIES

The build you present is solid. Also try utility tree with a Defensive or Offensive secondary tree if you like, this works amazing since her rework since she's more naturally tanky now and doesn't rely on runes/masteries to do so. The movement and other utility is awesome most of the game. This applies especially to early-mid game.