Sett Build / Runes
In LoL's classification, Sett is a "Fighter". He dives into the heart of Melee to deal decent damage and take it as well. He is an AD character, so he deals physical damage, so he is found in Toplane. While he is rather slow, he becomes devastating once he gets to melee with excellent damage, control and defensive tools.
Late Game Items
Spell Skill Priority
To play Gwen to her full potential, we recommend using runes that give you good dueling skills. The primordial rune "Conqueror" fulfills this function very well. Regarding her build, in order of priority we recommend you to buy a Stridebreaker, Plated Steelcaps, Blade of the Ruined King, Sterak's Gage, Dead Man's Plate and Guardian Angel.
Sett's Pit Grit! passive affects his basic attacks. Instead of attacking normally with a set attack speed, his second attack always goes off faster than the first and deals extra damage. Sett's Q is his only mobility spell, making him run faster towards opponents and boosting the damage of his next two attacks. His Q, Haymaker, allows him to store some of the damage he takes passively, then spend it, giving himself a shield based on the HP he's lost recently, and dealing damage in a wide cone in front of him. His E allows him to bring enemies from either side towards him, stunning them if he catches an opponent on either side.
His ultimate ability, The Show Stopper, allows Sett to grab an opposing Champion and carry him through the air before crushing him to the ground, dealing damage to him and any opponents in the impact zone.