What is the best build for Kassadin Mid Lane in Patch 16.5?

The optimal Kassadin Mid Lane build starts with Long Sword and Refillable Potion. Core items are Youmuu's Ghostblade, Opportunity, Serylda's Grudge with Boots of Lucidity. Run Flash and Ignite as summoner spells.

What runes should I use on Kassadin Mid Lane?

Kassadin Mid Lane runs Electrocute as the keystone in Domination with Sudden Impact, Eyeball Collection, and Treasure Hunter. Secondary tree is Precision with Triumph and Legend: Haste.

Is Kassadin good in Patch 16.5?

Kassadin is B tier in Mid Lane with a 49.4% win rate in Emerald+ ranked games on Patch 16.5, according to OP.GG data. Kassadin is a solid, balanced pick.

What are Kassadin's power spikes in Mid Lane?

Kassadin hits a significant power spike when completing Youmuu's Ghostblade. The two-item spike with Youmuu's Ghostblade and Opportunity is when Kassadin becomes a major threat. Skill priority is Q > E > W, so maxing the primary ability first accelerates early-game power.

When should I pick Kassadin in ranked?

Kassadin is a B tier Mid Lane pick in Patch 16.5 with a 3.5% pick rate. Kassadin works well as a Assassin and Mage and fits team compositions that need burst damage and pick potential.

What summoner spells should I run on Kassadin Mid Lane?

The recommended summoner spells for Kassadin Mid Lane are Flash and Ignite. This is the highest win-rate combination in Emerald+ ranked games on Patch 16.5.

What is Kassadin's hardest matchup in Mid Lane?

Diana is one of the toughest Mid Lane matchups for Kassadin. Diana is S+ tier with a 53.4% win rate. Use Meridian Zero's matchup analysis tool to get detailed trading patterns and win conditions for Kassadin vs Diana.

Kassadin Mid Lane Guide — Patch 16.5 Builds, Runes & Matchups

Kassadin is a B tier Mid Lane champion in League of Legends Patch 16.5 with a 49.4% win rate in Emerald+ ranked games, according to OP.GG data. The optimal Kassadin build starts with Long Sword and Refillable Potion, with core items being Youmuu's Ghostblade, Opportunity, Serylda's Grudge and Boots of Lucidity. For runes, run Electrocute from Domination with Precision as the secondary tree. Skill priority is Q > E > W. Kassadin is best played with Flash and Ignite as summoner spells. The most challenging matchup in Mid Lane is Diana (S+ tier, 53.4% win rate).

Source: OP.GG Emerald+ ranked data, Patch 16.5 · Last updated: March 2026 · Meridian Zero Analytics

Best Build — Patch 16.5

Start Long SwordRefillable Potion

Core Youmuu's GhostbladeOpportunitySerylda's Grudge

Boots Boots of Lucidity

Spells FlashIgnite

Priority Q > E > W

Expert Tips

Never fight pre-6. Play passive and farm; your power spike doesn't exist before Riftwalk (R) is online.
Riftwalk amplifies damage with each additional cast in 15 seconds. Build up stacks before nuking a target.
Null Sphere (Q) interrupts channels and gives a magic shield. Use it proactively against Warwick, Nunu, Malzahar ultimates.

Mid Lane Matchups — Difficulty by Opponent

Opponent	Tier	Difficulty
Diana	S+	Hard	Analyze →
Ahri	S+	Hard	Analyze →
Zed	S+	Hard	Analyze →
Vex	S	Hard	Analyze →
Fizz	S	Hard	Analyze →
Zoe	S	Hard	Analyze →
Aurelion Sol	S	Hard	Analyze →
Twisted Fate	S	Hard	Analyze →
Xerath	S	Hard	Analyze →
Katarina	S	Hard	Analyze →
Mel	S	Hard	Analyze →
Sylas	S	Hard	Analyze →

Runes — Patch 16.5

KeystoneElectrocute

Primary TreeDomination

Slot 1Sudden Impact

Slot 2Eyeball Collection

Slot 3Treasure Hunter

Secondary TreePrecision

Secondary 1Triumph

Secondary 2Legend: Haste