Tryndamere

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This’ll be a Slaughter

Massive all-in 1v1 threat and split-pushing.

Precision

Improved attacks and sustained damage

Lethal Tempo

1.5s after damaging a champion gain a large amount of attack speed. Lethal Tempo allows you to temporarily exceed the attack speed limit.
Overheal

Excess healing on you becomes a shield.
Legend: Alacrity

Takedowns on enemies grant permanent Attack Speed.
Last Stand

Deal more damage to champions while you are low on health.

Domination

9% attack speed, 10 ability power or 6 attack damage

Sudden Impact

Gain a burst of Lethality and Magic Penetration after using a dash, leap, blink, teleport, or on leaving stealth.
Ghost Poro

When you enter brush, a poro appears. It will stay behind to give you vision.

WhyLethal Tempo

Lethal Tempo on Tryndamere allows you to get an insane amount of Auto Attacks in during trades, all-ins, and during your [R]. In the mid to late game your Attack Speed gets so high that you become an incredibly scary threat to the backline.

WhyOverheal

Overheal synergizes well with Tryndamere's constant self healing from [Q] and BotRK allowing you to enter trades/fights with the early health advantage.

WhyLegend: Alacrity

More Attack Speed means more raw damage, kill threat, and split-pushing tower potential.

WhyLast Stand

Last Stand is the perfect damage rune for Tryndamere synergizes insanely well with your[R]. As you pop [R] at low health you'll have a few seconds of being able to deal massive amounts of damage.

WhySudden Impact

Sudden Impact synergizes well with Tryndamere's [Q] when looking to spin in for the all-in kill.

WhyGhost Poro

Ghost Poro provides fantastic on-demand lane safety when you're able to keep the enemy shoved in and keep the poro in the river brush uncontested.