Tryndamere gains Fury for each attack, critical strike, and killing blow he makes. Fury passively increases his Critical Strike Chance and can be consumed with his Bloodlust spell.
1
Bloodlust
Tryndamere thrives on the thrills of combat, increasing his Attack Damage as he is more and more wounded. He can cast Bloodlust to consume his Fury and heal himself.
2
Mocking Shout
Tryndamere lets out an insulting cry, decreasing surrounding champions' Attack Damage. Enemies with their backs turned to Tryndamere also have their Movement Speed reduced.
3
Spinning Slash
Tryndamere slices toward a target unit, dealing damage to enemies in his path.
Ult
Undying Rage
Tryndamere's lust for battle becomes so strong that he is unable to die, no matter how wounded he becomes.
Ability descriptions from the official Wild Rift website.
This page is for League of Legends: Wild Rift (the mobile game), not League of Legends on PC. A Japanese version with guides and matchup notes is available: 日本語版.