Description
On Cast is an effect that fires the instant a unit casts its ability.
Items like these reward you for landing as many casts as possible.
- Lich Bane.
- The Invoker Emblem.
Items with On Cast effects (6)
How it links selected
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On-cast effect selected
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- +250 HP
- +35 MR
- +15% AP
30% Shred enemies within 2 hexes. When enemies cast an Ability, deal magic damage equal to 150% of the Mana spent. Shred: Reduce Magic Resist
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- +500 HP
- +70 MR
- +30% AP
30% Shred enemies within 2 hexes. When enemies cast an Ability, deal magic damage equal to 300% of the Mana spent. Shred: Reduce Magic Resist
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- +10% AS
- +55% AP
The holder’s first attack after each Ability cast deals a Stage-scaled amount bonus magic damage. Damage increases based on Stage.
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- +15% AD
- +15% AP
- +1 Mana Regen
After casting the first time in combat, gain 110 Mana over 5 seconds.
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- +2 Mana Regen
The holder gains the Invoker trait. On cast, gain Ability Power equal to 8% of Mana spent.
Your team gains Mana Regen, increased for Invokers.
- 2
- 1 Mana Regen | 3 Mana Regen
- 3
- 1 Mana Regen | 4 Mana Regen
- 4
- 2 Mana Regen | 6 Mana Regen
- 5
- 2 Mana Regen | 8 Mana Regen
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- +25% AP
The holder gains the Spellweaver trait. Gain 2 Mana whenever an ally casts their Ability.
Your team gains 10% Ability Power. Spellweavers gain more, plus extra Ability Power whenever a Spellweaver casts an Ability.
- 2
- 10% , +1% per cast
- 4
- 30% , +1% per cast
- 6
- 55% , +2% per cast
Champions with On Cast effects (17)
How it links selected
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17 shown · 8 team slots — forms of one champion share a slot
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Razor Leaves Summon five razor-sharp leaves that converge on the current target, dealing a total of 340 / 510 / 770 physical damage and applying 20% Wound and 1% Burn for 4 seconds. Scarlet Buff: Cinderling gains 22% Attack Damage each cast. Wound: Reduces healing received. Burn: Deals a percent of the target's max Health as true damage every second. -
Uproot Passive: Restore 17 / 27 / 43 Health each second, tripled for 3 seconds after casting. Active: Lunge out of the ground, Stunning adjacent enemies for 1 second and dealing 70 / 105 / 160 magic damage to them. -
Spider Queen Transform into a spider and gain 375 / 475 / 725 max Health. Attacks while in Spider Form deal 35 / 50 / 80 bonus magic damage and heal for 55 / 90 / 170 . Subsequent casts grant 175% decaying Attack Speed for 4 seconds.
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Fungus Among Us Throw 2 clusters of mushrooms that deal 55 / 82 / 155 magic damage to the 3 nearest enemies. Then hurl a giant mushroom that deals 135 / 200 / 310 magic damage to the target. Each cast has a 10 / 12 / 15% chance to forage an extra mushroom that can be collected for bonus effects. Red: 1 Reroll Green: 1 Tactician Health Yellow: 2 XP
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Forest's Flurry Blink away from the current target, deal 270 / 405 / 1200 physical damage to them, and gain 30 / 30 / 100% Attack Speed. Every 4th cast consumes the Attack Speed granted from Forest's Flurry and fires a blast through the largest group of enemies that deals 385 / 580 / 2500 physical damage, reduced by 25% for each enemy it passes through (minimum 50%).
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Azure Shockwave Gain 480 / 684 / 2421 Shield for 4 seconds. Slam the ground, sending a fissure in the direction of the most enemies. Enemies hit are briefly knocked up, take 100 / 150 / 3500 magic damage, and are Mana Reaved for 10. Blue Buff: Each time Sentinel casts, allies gain 2 Mana Regen. Mana Reave: Increase the Mana cost of the next Ability cast.
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Triggerseed Passive: Shields from this Ability can critically strike with Precision. Active: Grant 2 / 2 / 10 allies 185 / 350 / 3000 Shield and 10 / 15 / 100% Damage Amp for 6 seconds. Then deal 155 / 235 / 2000 magic damage to enemies adjacent to them. After casting 6 times, also grant 100% stacking Attack Speed to targets.
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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 largest group of enemies that deals 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Blackthorn Bonus: Stuns targets hit for 1 second.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Blossom Bonus: The first target hit is dealt 10% bonus damage.
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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 375 / 565 / 6500 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.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Elderwood Bonus: Casts grant all allies 2.5% increased max Health for the rest of combat.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Fae Bonus: Heals the lowest percent Health ally for 18% of ability damage dealt.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Inferno Bonus: Restores 10 mana per takedown.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Lunar Bonus: Applies 8% Vulnerable to enemies hit for 4 seconds. Vulnerable: Increases damage taken
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Primal Bonus: Gain 60% Attack Speed for 6 seconds after cast.
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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 375 / 565 / 6500 magic damage, reduced by 25 / 25 / 10% for each enemy hit (minimum 40%). Solar Bonus: Deal 15% bonus damage. For each unique 3-star champion fielded, deal an additional 12% bonus damage.
Augments with On Cast effects (1)
Traits with On Cast effects (3)
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Your strongest Alune cycles to a new phase of the moon after each cast. While the moon is at or below half full, your team gains 7% Durabilty. While above, your team gains 7% Damage Amp.
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Gain 1 seed when your strongest Ivern casts, plus 3 every combat. Ivern uses 5 seeds to grow a hex on your board that grants a bonus to its occupant.
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Your team gains 10% Ability Power. Spellweavers gain more, plus extra Ability Power whenever a Spellweaver casts an Ability.
Wisps with On Cast effects (1)
What enables On Cast (1)
- Quicken Combat
On cast, your champions gain 30% Attack Speed for 4 seconds.
Frequently asked questions
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What does "on-cast" actually mean in TFT?
On-cast effects fire the moment a unit casts its Special Ability. That is the same instant the mana bar empties and the ability triggers.
- TFT abilities have no cooldowns.
- The only gate on the cast is the mana bar filling.
- Any item, trait, or augment text that says "on cast," "each cast," or "after casting" hooks into that single ability-fired event.
The wiki notes most ability casts complete in roughly 0.5 seconds. So on-cast effects feel near-instant in practice.
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What kinds of effects are wrapped in "on cast" text?
A few payload shapes are the most common.
- A flat or percent Mana refund.
- A chunk of healing or shielding.
- A stacking damage amp on the next attack.
- A buff to nearby allies scaled by Mana spent.
Three item archetypes carry it in the current pool.
- The spellblade, whose text reads "first attack after each Ability cast deals bonus magic damage".
- The artifact that hands back a large pool of Mana over several seconds once the holder has cast.
- The artifact that permanently shrinks the holder's Mana bar a little on every cast.
All three are gated entirely on the cast event. So none of them does anything at all before the unit casts.
Sources
- TFT.Tools — current-set items (Lich Bane: "first attack after each Ability cast"; Manazane: "After casting the first time in combat, gain 110 Mana over 5 seconds"; Dawncore: "Subsequent spellcasts reduce max Mana by 5%") (opens in new tab)
- Items — tactics.tools (the same three artifact and item texts, independent listing) (opens in new tab)
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How does mana-on-cast / mana refund work?
Some on-cast effects bank a chunk of mana straight back into the bar. So the next cast comes faster.
The classic shape is a fixed post-cast set. An item or trait says "after casting, set mana to N". This guarantees the second cast starts much closer to its threshold than a normal post-cast reset would.
On-cast mana that would push the bar above its max also carries over to the next cast. The wiki's worked example: 50/60 + 20 = 10/60 after casting. So a refund plus overflow can accelerate the next cast by more than the printed number.
Note: This exact shape has rotated in and out of specific items across patches. An item that carried it in one set may be reworked into something else entirely in the next. Check current tooltips for which item, if any, actually ships the mana-set shape in the set you're playing.
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Does an on-cast effect still trigger if my unit is stunned before it casts?
No.
A stunned unit "is unable to move, declare attacks, or cast their Special Ability for the duration". So if crowd-control lands while the bar is full but the cast has not gone off yet, the cast is suppressed. Nothing on-cast triggers.
The cast event is what the on-cast hook listens for. No cast, no trigger.
Note: Once the stun ends, a fully-charged unit will cast at the next available frame. On-cast effects fire then.
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Does an on-cast effect fire on every cast, or only the first one?
It depends on the tooltip. Both shapes ship, and they read almost identically at a glance.
"Each Ability cast" and "subsequent spellcasts" mean every cast for the whole fight. The spellblade re-arms after each one. The bar-shrinking artifact takes another slice off max Mana every single time.
"After casting the first time in combat" means exactly once. That artifact pays out its Mana on the opening cast. Then it sits idle for the rest of the round, no matter how many more casts follow.
The practical difference is large.
- An every-cast effect rewards a low-Mana unit that fires repeatedly.
- A first-cast-only effect is worth the same on a unit that casts twice as on one that casts ten times.
So a first-cast-only effect belongs on a slow, expensive caster you want to get going early.
Sources
- TFT.Tools — current-set items (one-shot: "After casting the first time in combat…"; every-cast: "Subsequent spellcasts reduce max Mana by 5%" and "first attack after each Ability cast") (opens in new tab)
- Items — tactics.tools (same one-shot vs every-cast wordings, independent listing) (opens in new tab)
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If a unit holds two on-cast items, do both trigger on the same cast?
Yes.
Different on-cast effects from independent sources each listen for the same cast event. They resolve in parallel when it fires. Independent sources include:
- Two distinct items.
- An item plus a trait.
- An augment plus an item.
One cast can do all of this at once:
- Hand back Mana from one artifact.
- Shave the Mana bar with a second.
- Arm a bonus-damage attack from a third.
Note: What does NOT double up is the same item equipped twice. Artifacts are single-equip. Several spell it out in their own rules line, "Unique - only 1 per champion". So two copies of one on-cast payload cannot sit on one unit. If you want more of the same effect, spread the copies across different casters instead.
Sources
- TFT.Tools — current-set items (two independent on-cast artifacts: the Mana refund and the max-Mana shrink) (opens in new tab)
- Items — tactics.tools (same two artifacts, independent listing) (opens in new tab)
- Item (TFT) — League of Legends Wiki (Artifact category — single-equip restriction) (opens in new tab)
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Is "on-cast" the same as "post-cast" or the mana-lock window?
No. They overlap, but they are not the same.
On-cast is the trigger event. It fires the instant the ability resolves.
The mana-lock window is the brief no-mana-gain period that begins right after that cast. It lasts roughly a second, longer for some long-channel champions. It is about gating when the bar can start refilling, not about firing effects.
So the order in a fight goes like this.
- The on-cast item resolves first.
- Then the mana-lock clock runs.
- Then the bar starts filling again.
Note: Any on-cast mana refund is applied before the lock starts ticking.
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Do on-cast items do anything on a manaless unit?
No.
A manaless unit has no mana bar. It "never casts a triggered Special Ability — instead it has a permanent passive effect that's active for the entire combat". So there is no cast event for an on-cast effect to hook into.
Items whose payload is gated entirely on a cast do nothing on a manaless holder. That covers:
- First-attack-after-cast bonuses.
- Heal-on-cast lockets.
- Mana-refund items.
- On-cast shield/buff effects.
Note: Whether any given set even ships manaless units rotates set-to-set.