Sejuani
Scrap, Stun, and Succeed
Lane harassment and consistent damage output.
After
immobilizing an enemy champion gain defenses and later deal a burst of magic damage around you.
Impairing the movement of an enemy champion heals nearby allied champions.
After 12 min gain +8 Armor and +8 Magic Resist and increase your Armor and Magic Resist by 3%.
Gain permanent max health when minions or monsters die near you.
Takedowns restore 5% of your missing health and grant an additional 20 gold.
Takedowns on enemies grant permanent Basic Ability Haste.
Offense
+5 AD or 9 AP
-
Flex
+5 AD or 9 AP
Defense
+6 Armor or 8 MR (match-up)
Why Aftershock
Like Courage of the Colossus, Sejuani can reliably proc it for the bonus defenses and extra bit of damage.
Why Font of Life
All 4 of Sejuani's abilities can easily proc Font of Life, and because you naturally stack health the on-hit heal adds up to be considerable for fights.
Why Conditioning
Conditioning's mid-game resists make you an insane front-line tank in teamfights.
Why Overgrowth
Because you naturally itemize stacking a lot of health as Sejuani, Overgrowth doubles-down on that by providing a lot of bonus scaling health based on how much health you've built.
WhyTriumph
Triumph on Sejuani allows you to fronline for you team in teamfights to absorb a lot of damage, and keep going after you pick up assists.
WhyLegend: Haste
Tenacity allows you to stick to your target for repeated autos and help sure an [E] stun.