I am a seju main
I really liked sejuani and I would like to share my experience
I start main seju in Season 11 ( I start play in season 10 in august)



My Nick : Nex1n #EUNE
Steam: https://steamcommunity.com/id/NexinDie/

+ Lots of Crowd Control
+ Really tanky
+ Damage/Tankiness scale with HP

- No natural sustain (need warmog)
- Weak against Fighters/Bruisers
- Vulnerable to counter jungle

Arctic Assault
Range: 650
Cooldown: 20 / 18 / 16 / 14 / 12
Cost: 70 / 75 / 80 / 85 / 90
Sejuani charges forward, knocking enemies into the air for 0.5 seconds and dealing 80 / 130 / 180 / 230 / 280 (+60% of ability power) magic damage (max 300 damage to monsters). The charge stops after colliding with an enemy champion.

Winter's Wrath
Cooldown: 9 / 8 / 7 / 6 / 5
Cost: 65
Sejuani swings her flail in a cone in the target direction, dealing 20 / 25 / 30 / 35 / 40 (+ 2% maximum health) (+20% of ability power) physical damage to all enemies hit and knocking back minions and monsters.

She then lashes out with her flail in a straight line in the same direction, dealing an additional 30 / 70 / 110 / 150 / 190 (+ 5.25% maximum health) (+60% of ability power) physical damage and applying Frost.

Permafrost
Range: 600
Cooldown: 1.5
Cost: 55
Passive: Sejuani and nearby melee allies apply Frost with their basic attacks, stacking up to four times. Sejuani can cast Permafrost on enemies with max Frost stacks.
Active: Sejuani can freeze an enemy champion, epic/large/medium monster, super minion or siege minion, dealing 55 / 105 / 155 / 205 / 255 (+60% of ability power) magic damage and stunning them for 1 second. Once consumed, enemy champions cannot gain Frost for 8 seconds. Permafrost resets Sejuani's basic attack timer.

Glacial Prison

Range: 1175
Cooldown: 130 / 100 / 80
Cost: 100
Sejuani throws a True Ice bola in a line, dealing 125 / 150 / 175 (+40% of ability power) magic damage and stunning for 1 second the first enemy champion that collides with.
Bolas are empowered after traveling 400 distance, increasing their damage to 200 / 300 / 400 (+80% of ability power) and stun duration to 1.5 seconds. Stunning a target with Glacial Prison triggers Permafrost's per-target stun cooldown.
Empowered bolas also leave behind an ice storm that explodes after a brief delay. The storm lasts 2 seconds and slows enemies by 30% while inside the AoE. The explosion deals 200 / 300 / 400 (+80% of ability power) magic damage and slows enemies by 80% for 1 second.

JUNGLE ROUTE

Start At Red buff after Raptors After wolfs After blue buff After Grump AND after crab 3:15
Enjoy this patching :)

Use ult to enemy after engage with q use your W ability and E ability and tank this fight
ez Wins