Briar Noxus Slayer Juggernaut 1g

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Briar's combination of Slayer and Juggernaut allows her to jump into the fray with Blood Frenzy while having a good amount of sustain. This leaps towards the furthest enemy within range while gaining Move Speed, Attack Damage, and decaying Attack Speed.
As a high value triple trait 1-cost unit, Briar should be a popular snag.
Qiyana Ixtal Slayer 1g

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Qiyana's Clear the Brush ability has her dash to a nearby hex, swinging forward at enemies in a 2-hex line. The close range AoE goes pretty well with Slayer's Omnivamp, but outside of that she's a pretty basic unit.
Tryndamere Freljord Slayer 2g

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Tryndamere follows alongside Ashe, strengthening them both with their Bloodsword Bond, granting them permanent stats whenever they get a kill.
As for active ability, Undying Rage, this grants increased Durability and replaces his attacks with empowered strikes. He also ignores a percentage of the foe's Armor if they are Chilled, which goes hand in hand with Ashe.
Yasuo Ionia Slayer 2g

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Yasuo is a fairly basic Slayer on his own, but once he reaches 3-stars, he summons his brother alongside him. Through their Blade Brothers ability, they'll assist each other during casts, creating a whirlwind of blades strikes.
He clearly provides a strong baseline for Ionia, but could also be splashed in as a 2-cost Slayer when needed.
Gangplank Bilgewater Slayer Vanquisher 3g

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Gangplank's Powder Kegs involves tossing and detonating barrels as they hit the three nearest enemies. Each one reduces the target's Armor, and is further amplified if it Crits.
As a 3-cost three trait unit, Gangplank sits in a nice spot already. Though he'll be even more valuable in physical comps that can capitalize on the Armor reduction.
Bel'Veth Void Slayer 4g

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Bel'Veth transforms after activating Endless Banquet, dealing physical damage to nearby foes, and empowering herself with increased Attack Speed, Move Speed, Health, and bonus true damage. On takedowns, she gains even more (decaying) Attack Speed.
All of this compliments Slayer perfectly, as she'll get up close and personal while sustaining herself with Omnivamp. Overall, seems quite solid.
Yone Ionia Slayer 4g

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Yone matches Yasuo with the Ionia Slayer trait combination, but is the true threat among the two Blade Brothers. His Kin of the Stained Blade ability strikes through the largest cluster of enemies in range, knocking them up and dealing damage to them, all while Yasuo blinks in.
Additionally, each basic attack alternates between bonus physical or magic damage, allowing him to strike on both axis. Yone is clearly a big threat once acquired, so if you're in Ionia, 3-star Yasuo should be a huge priority.
Aatrox Darkin World Ender Slayer 5g

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Aatrox is one of the two base Darkin, with the only other unlocking through an extraordinarily rare circumstances. His unique World Ender trait grants him Attack Damage equal to his Omnivamp, which pairs perfectly with the Slayer trait.
On top of that, he revives after his first death, and gains increased Durability and reduced maximum Mana, making him even stronger.
When casting his Darkin Blade ability, he cycles through one of three abilities. He'll either slash in a line, swipe in a cone, or slam on his target. The first Sunders, the second knocks up, and the third executes those within the threshold.
Needless to say, Aatrox is absolutely absurd, and probably worth including onto any team that can afford the space (without hindering trait bonuses). He's a gigantic threat even without other Darkin, so be sure to consider him whenever he shows up!
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