
Dark Seal
350 goldThis is the most-supported Draft/Ranked starting item in the frozen prior-patch public role snapshot. Compare its durability, sustain and damage trade-off before leaving base.
Game patch 26.20Data Dragon 16.20.1
Reference patch 16.20.1
Kassadin has an established central-lane plan with access to waves, both sides of the river and meaningful pressure between objectives.
These patches track recommendation review, build validation and item lookup separately. Updating item data does not complete a build review.
Normal Draft · Mid
Follow the completed-item order as a pre-game reference. Components and owned items do not create extra inventory slots.

This is the most-supported Draft/Ranked starting item in the frozen prior-patch public role snapshot. Compare its durability, sustain and damage trade-off before leaving base.

This item is part of the most-supported coherent core in the frozen prior-patch public role snapshot. Treat the sample as context, then adjust only for a clearly identified matchup problem.

This is the most-supported Boots choice in the frozen prior-patch public role snapshot; change it when the opposing damage or crowd control calls for a different defence.

This item is part of the most-supported coherent core in the frozen prior-patch public role snapshot. Treat the sample as context, then adjust only for a clearly identified matchup problem.

This item is part of the most-supported coherent core in the frozen prior-patch public role snapshot. Treat the sample as context, then adjust only for a clearly identified matchup problem.

Keeps a reviewed late option after the prior-patch cross-check; move or replace it only when its stated match problem is present.

Completes the six-item inventory with movement speed and ability haste for repeated late-game spell rotations.
Complete build choices
Recommendation review pending
Best when: Morellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.
Best when: Zhonya's stasis can absorb a committed dive or lethal burst window.
Best when: Banshee's spell shield can protect the first important cast against you.
Best when: Void Staff becomes valuable when the target has bought meaningful magic resistance.
Runes and summoner spells
Create one clean burst window after managing the Mid wave instead of forcing every cooldown into the lane.
Ignite supports a short kill window; Teleport supports recall and map timing; Barrier protects against immediate burst.
A more aggressive spell pair does not replace safe wave timing, river vision or an escape route.
Static alternatives
These choices are not selected from live scores. Use one only after you identify the stated match problem yourself.

Oblivion Orb supplies healing reduction without committing to a completed Morellonomicon. Skip both when healing is not the problem or an ally already covers your target reliably. Healing reduction does not reduce shields.
Conditional component, not a core item. Complete Morellonomicon only when its stats and slot efficiency justify delaying another purchase.
Zhonya's stasis can absorb a committed dive or lethal burst window.

Banshee's spell shield can protect the first important cast against you.

Void Staff becomes valuable when the target has bought meaningful magic resistance.
Situational AP purchase
Buy healing reduction when enemy healing or regeneration is deciding fights and you can keep damaging the relevant target. Grievous Wounds reduces healing; it does not reduce shields, magic damage or crowd control.
Oblivion Orb can provide healing reduction without immediately paying for a completed Morellonomicon. Fit the component around your core damage, mana and survival needs; check the current queue's item tooltip.
Complete Morellonomicon when its stats and slot efficiency suit your build. Do not treat it as a mandatory first item just because your champion deals magic damage.
Multiple Grievous Wounds sources do not add their percentages together. Another reliable applier may cover the same target, but you may still need your own source for a separate fight or target.
Repeated spell damage and damage over time can maintain coverage more reliably than a single hit. Match the purchase to your actual spell access, enemy sustain and the teammates who can apply the debuff.
If you die before dealing damage, you apply no healing reduction. If your target dies before healing, there is little healing to prevent. The debuff applies on qualifying damage immediately; it does not need to build up. It remains briefly after your last hit, so teammates can benefit even after you disengage.
Only healing during the active debuff counts. For example, 40% reduction prevents 80 of a 200-point heal, or 400 of a 1,000-point heal, before other modifiers. Compare that with the damage, penetration or survival you delayed; neither example guarantees a kill. Healing after the debuff expires is unaffected.
See the Oblivion Orb and Morellonomicon references for current effects and queue availability. These are situational decisions, not a measured best-build claim.
Kit reference
Ability names, descriptions and numeric fields come from Riot Data Dragon. Practical reads are independently written; the current in-game tooltip remains authoritative.

What it doesKassadin takes reduced magic damage and ignores unit collision.
Practical readVoid Stone is an automatic part of the kit involving damage. Track when its condition is active instead of treating every fight the same way.

What it doesKassadin fires an orb of void energy at a target, dealing damage and interrupting channels. The excess energy forms around himself, granting a temporary shield that absorbs magic damage.
Practical readNull Sphere is a ranged cast involving protection or sustain and damage. Respect its line or target area, and avoid spending it when the opponent can simply step away before the important exchange.
This cast has a wind-up, charge or channel. Movement, interruption or a changing target state can matter before the effect completes.
The protection or sustain is part of the cast's value. Compare its timing with incoming damage rather than reading only the offensive effect.

What it doesPassive: Kassadin's basic attacks deal bonus magic damage. Active: Kassadin's next basic attack deals significant bonus magic damage and restores Mana.
Practical readNether Blade contributes basic-attack interaction and damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.

What it doesKassadin draws energy from spells cast in his vicinity. Upon charging up, Kassadin can use Force Pulse to damage and slow enemies in a cone in front of him.
Practical readForce Pulse contributes a slowing effect and damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.

What it doesKassadin teleports to a nearby location dealing damage to nearby enemy units. Multiple Riftwalks in a short period of time cost additional Mana but also deal additional damage.
Practical readRiftwalk contributes damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.
The cast changes position or access. Account for where the champion finishes, not only where the ability begins.
Adapt the plan
Judge the whole lane or map state, not only personal kills. Choose the situation closest to the current game.
Push safely, then threaten vision, a side lane or the enemy jungle without abandoning free farm.
Reach river first with your Jungler and preserve the cooldown needed if the opponent contests.
Pressure a valuable target while respecting the control that can end your lead.
Trade when your key ability and minion position favour you; an even lane does not require a forced solo kill.
Move on a completed wave and return before several waves are lost to the tower.
Position for the champion's reliable damage or control instead of beginning with the lowest-percentage spell.
Use range, tower space and vision. Do not contest every last hit if it opens another kill.
Ping missing early and take the safe route; blindly matching a stronger roam can lose two positions.
Group around your most dependable control and damage rather than searching alone for a comeback.
Pings, movement and objectives
Mid can reach either side, but the wave pays for every move. Communicate the opponent first, then move only when the route and destination are credible.
Pings create a shared plan; they do not replace checking waves, vision and who can move.
Push, catch or communicate the wave before leaving so the opponent does not gain a free move and free income.
Use On My Way for the route you are actually taking and Danger where an unseen opponent may arrive.
Move through controlled vision with the Jungler or another ally instead of face-checking the objective alone.
Decide whether you are engaging, front-lining, flanking or protecting a carry before the fight begins.
Later objectives: Repeat the same process around later major objectives: handle nearby income, communicate the route, enter through vision and agree on the fight before committing.
Use the guide
Compare a specific opponent, return to the champion overview, or choose another champion without losing the queue distinction.