Description
Reduces the target's Armor for a duration.
Items (4)
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- +250 HP
- +20 MR
30% Sunder enemies within 2 hexes. Gain 15 Armor and Magic Resist for the first 15 seconds of combat. Sunder: Reduce Armor
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- +15% AD
- +20% AS
- +20% Crit
Attacks and Ability damage 30% Sunders the target for 3 seconds. This effect does not stack. Sunder: Reduce Armor
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- +500 HP
- +40 MR
30% Sunder enemies within 3 hexes. Gain 50 Armor and Magic Resist for the first 20 seconds of combat. Sunder: Reduce Armor
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- +45% AD
- +40% AS
- +40% Crit
Attacks and Ability damage 30% Sunders the target for the rest of combat. This effect does not stack. Sunder: Reduce Armor
Traits (1)
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Caustic damage 30% Shreds and Sunders enemies for 4 seconds. Shred: Reduce Magic Resist Sunder: Reduce Armor
More Sunder sources
What enables Sunder (1)
Champions (1)
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Flock Family Summon 4 untargetable Tiny Beaks nearby for 5 seconds. Whenever Mama Beak attacks, Tiny Beaks attack the same enemy, dealing 20 / 30 / 48 physical damage. Orange Buff: Dealing physical damage reduces enemy Armor by 2.
What benefits from Sunder (3)
Champions (3)
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Deadly Plumage Gain 50% Attack Speed for the next 5 attacks. These attacks are replaced with feathers that deal 68 / 102 / 155 physical damage and reduce Armor by 2 .
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Rage Gene Passive: Gain 5 / 5 / 50 Rage per second and 5 Rage per attack. Active: Transform into Mega Gnar and leap into the largest group of enemies within 3 hexes. Then, deal 100 / 150 / 2000 physical damage to enemies within 2 / 2 / 10 hexes, reduce their Armor and Magic Resist by 15 / 20 / 100 , and Stun them for 1 / 1 / 15 second. Mega Gnar gains 400 / 600 / 10000 Health, and replaces his Ability with Grab n' Throw. Grab n' Throw: Throw the target at the farthest enemy, dealing 380 / 570 / 9000 physical damage to them and 135 / 205 / 4500 physical damage to enemies they pass through. If there's only 1 enemy left, throw them off the battlefield instead.
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Final Spark Passive: On cast, all allies that share a trait with Lux gain 3 / 3 / 100 mana. Active: Fire a laser towards the most enemies in a line that deals 330 / 520 / 5000 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Coven Bonus: Reduces the Armor and Magic Resist of targets hit by 8 for the rest of combat.
See also
What Sunder counters
Frequently asked questions
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What is Sunder in TFT and how much Armor does it remove?
Sunder is the standard percent-Armor-reduction debuff: while a unit is Sundered, its Armor is reduced by a fixed percentage for the listed duration. The default value across most current item-applied sources is 30% Armor for 3 seconds, applied off attacks and Ability damage. Because the reduction is percentage-based rather than flat, it scales with the target's Armor pool — the more Armor the enemy has stacked, the more raw Armor is removed, which is why Sunder is the AD-side counter to heavy frontlines (mirroring Shred on the magic-resist side).
Sources
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Does Sunder stack from multiple sources?
No. The percent-Sunder keyword does not stack. When two Sunder sources hit the same target, only one application is active at a time — the strongest active debuff takes priority for its duration, rather than the percentages adding together. Item tooltips state this explicitly with "This effect does not stack." The practical consequence: doubling up Sunder items on the same carry doesn't double the Armor cut. The non-stacking clause matches Shred's behaviour on the magic-resist side and is Riot's standard treatment of these resistance debuffs.
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How is percent-Sunder different from flat Armor reduction?
They're separate keywords with different stacking behaviour. Sunder is percent-based — it removes a fraction of the target's current Armor and follows the "does not stack" rule. Flat Armor reduction subtracts a fixed number from the Armor stat and follows different stacking rules, even when its tooltip also reads "reduce Armor." Order of operations matters: flat reduction is calculated first, then percent Sunder operates on the remaining Armor. Stacking flat reduction in front of Sunder makes the percent step less impactful because it works against a smaller Armor pool.
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Where does Sunder come from in TFT — items, abilities, or traits?
All three. The most common source is item passives that Sunder on attack/Ability damage (the percent-Armor-reduction items players build for AD-heavy boards), but specific champion abilities and trait actives also apply Sunder, with values and durations that vary per source and per patch. Augments and charms can grant Sunder as well. Functionally, the Sunder keyword behaves the same regardless of source — it's the application duration, percent, and trigger condition that differ. Always check the source's own tooltip for the exact value and timing on the current patch.
Sources
- Last Whisper (TFT) — League of Legends Wiki (item-applied Sunder) (opens in new tab)
- Utility Sources — Burn, Shred, Sunder, Stun and more — LeDuck (Tacter, lists item/ability/augment Sunder sources) (opens in new tab)
- Adverse Effects — Tacter (per-champion percent and flat sources) (opens in new tab)
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If Sunder is reapplied while it's already active, what happens to the duration?
The strongest active Sunder takes priority for its remaining duration — applying the same percent again doesn't add a second instance, and a weaker reapply won't override a stronger one already running. In practice, two carries each running 30% Sunder aren't better than one — only one debuff is active at a time. The exact "does the timer refresh on each tick" detail is not officially documented; community-observed behaviour is that continuous attack uptime from a Sunder source keeps the debuff applied through a fight.
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Can Sunder reduce a unit's Armor below zero in TFT?
No. TFT floors resistances at 0. Once Sunder and other Armor-reduction effects bring a target to 0 Armor, further reduction is wasted: incoming physical damage is fully unmitigated (effectively true damage), but it isn't amplified — the Armor reduction multiplier tops out at 1.0×. This is a deliberate divergence from base League of Legends, where negative Armor can amplify damage. TFT patched the behaviour years ago so a specific carry's Armor reduction could no longer push the stat below 0; the 0-armor floor remains in place on the current patch.
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What's the difference between Sunder and Shred?
They're mirror keywords on opposite resistances. Sunder is the percent-Armor reduction debuff — it amplifies physical (AD) damage by lowering the target's Armor. Shred is the percent-Magic-Resist debuff — it amplifies magic (AP) damage by lowering MR. The default magnitude on item-applied sources is 30% on each, durations and stacking rules are analogous ("does not stack"), and the choice depends on the carry's damage type: Sunder for AD boards, Shred for AP boards. On mixed-damage boards, one of each is common since each only affects its own resistance.