While the identities of his parents are unknown, his lore states that his mother was an Ionian vastaya and his father a Noxian human.
The vastaya are a chimeric race of Runeterra and are already present in the game through Ahri, Nami, Neeko, Rakan, Rengar, Xayah and Wukong. They can be identified by their mixed animal and human characteristics.
Sett's family was expelled by the vastayan community for violating its tribal norms while his father's status as a pitfighter initially protected the family from any vocal disapproval by humans before his departure for more profitable foreign pits. Riot has confirmed that despite their similarities and his status as a pitfighter, Draven is not Sett's father.
In his anger, Sett's primal strength and ferocity allowed him to defeat opponents and become 'King of the Pit' while providing for his mother, before seizing control of the fighting arena for himself and turning it into an underground criminal empire.
As expected, Sett's kit is full of offensive physical damage abilities capable of hitting hard.
Passive - Pit Grit
Innate - Heavy Hands: Sett's basic attacks alternate between a left punch then a right punch. Sett begins attacking with a left punch, and will reset back to it after 2 seconds of not performing a right punch.
Sett's right punch gains 50 bonus range, attacks at 8 times the left punch's attack speed, and deals 5 âˆ’ 90 (based on level) (+ 15% AD) Attack damage bonus physical damage.
Innate - Heart of the Half-Beast: Sett gains Health regeneration icon 0.25 / 0.5 / 1 / 2 (based on level) health regeneration per second for every 5% of his missing health.
Q - Knuckle Down
Active: Sett gains 30% bonus movement speed within 1.5 seconds while moving towards enemy champions.
Sett's next two basic attacks within 5 seconds each deal bonus physical damage. Consuming an attack will refresh the timer.
(Bonus Damage = 10 / 20 / 30 / 40 / 50 (+ 1 / 2 / 3 / 4 / 5% (+ 1% per 100 AD) of target's maximum health))
Knuckle Down resets Sett's basic attack timer.
W - Haymaker
Passive: Sett stores 100% of the damage taken post-mitigation as Grit on his secondary resource bar, up to 50% of his maximum health. Each instance of accumulated Grit decays by 30% every second after 4 seconds.
Active: Sett blasts an area in the target direction, dealing physical damage to enemies hit. Enemies hit through the center take hybrid penetration true damage instead.
(Physical / True Damage: 90 / 125 / 160 / 195 / 230 (+ 25% (+ 10% per 100 bonus AD) of expended Grit))
Down but not out: Sett also gains a rapidly decaying Hybrid resistances icon shield for 3 seconds equal to the Grit expended.
E - Facebreaker
Active: Sett pulls in enemies at his front and back, dealing physical damage and Slow icon slowing them by 50% for 0.5 seconds.
(Physical Damage: 50 / 80 / 110 / 140 / 170 (+ 60% AD))
If Facebreaker affects at least one enemy on each side, all enemies are Stun icon stunned for 1 second upon landing.
R - The Show Stopper
Active: Sett suppresses the target enemy champion and then dashes unstoppably at a fixed distance toward it, carrying it along for 1.5 seconds before slamming it into the ground.
Enemies within the impact area take physical damage, reduced by up to 40% on the edges, and are slowed by 99% for 1.5 seconds.
(Physical Damage: 200 / 300 / 400 (+ 100% bonus AD) (+ 40 / 50 / 60% of primary target's bonus health))
The dash will prematurely end upon reaching a wall that cannot be dashed through.
Just like Senna and Aphelios in their recent releases, Sett will be getting a skin at launch from an all-new collection.
Mecha Kingdoms Sett is expected to drop in the same patch as the champion himself, with multiple gemstone-themed chromas available.
Skins for Draven, Garen, Jax and Leona will also feature in Mecha Kingdoms with Garen receiving the first Prestige Edition of 2020.
PBE Previewâ€” League of Legends (@LeagueOfLegends) December 12, 2019
Mecha Kingdoms pic.twitter.com/jTvKGYnBZR
After entering the PBE back in December, Sett should be released into the main game following the 10.1 patch update that will hit servers on 8th January.