Patch notes
Patch 15.17
Data Dragon 15.17.1 · 8/26/2025 · Official notes
TL;DR
Your fortune looks good thanks to Patch 25.17 🔮
Welcome to Season 3! This patch we've got a lot of updates across the game such as the return to the regular Summoner's Rift map for season 3, Doom Bots comes out of retirement, Xin Zhao gets a major glow up, a new battle pass, improvements to game info tracking like jungle timers, and a handful of quality of life and bugfixes. We've also got balance changes for ARAM, and a Fame reset for Arena! This is our second patch in a row aimed at adding new tools to play with and master. We're introducing Vayne and Sett in the jungle, AP Irelia, Lane Kayn, and buffing some weak items to make you rethink your AD assassin and AP haste builds. We've also got some small-scale balance updates, largely following up on other recent changes. Looking for more information on all things League of Legends? Check out our community-run wiki here! TFT patch notes here!
Champions
CHANGEDGwenBase Armor decreased, and Attack Speed Growth increased. R slow decreased at lower ranks.
Gwen is still very powerful in the hands of experts, especially pros, after her reshape in 15.6. While Gwen players have enjoyed her newfound agency in lane, we want to ensure she has some weak matchups and can't simply flip the script at level 6 with a guaranteed chasedown. We're delivering some compensation so as not to pull too much power out of her kit.
R - Needlework
Initial Slow: 60% → 30 / 45 / 60%
R - Needlework
Subsequent Slows: 25% → 15 / 20 / 25%
CHANGEDIreliaW AP Ratio increased. E cooldown decreased at higher ranks and AP damage ratio increased.
AP Irelia is currently not viable or picked at all so we are letting this blade dancer bring some magic to the rift by upping her burst ability when building ability power. We're focusing on her high counterplay skillshots in order to give her a distinct playstyle difference compared to AD builds.
W - Defiant Dance
Minimum Damage: 10 / 20 / 30 / 40 / 50 (+ 40% AD) (+ 40% AP) → 10 / 20 / 30 / 40 / 50 (+ 40% AD) (+ 50% AP)
W - Defiant Dance
Maximum Damage: 30 / 60 / 90 / 120 / 150 (+ 120% AD) (+ 120% AP) → 30 / 60 / 90 / 120 / 150 (+ 120% AD) (+ 150% AP)
E - Flawless Duet
Cooldown: 16 / 15 / 14 / 13 / 12 → 16 / 14.5 / 13 / 11.5 / 10
E - Flawless Duet
Damage: 70 / 110 / 150 / 190 / 230 (+ 80 AP) → 70 / 110 / 150 / 190 / 230 (+ 100% AP)
BUFFEDKassadinQ Damage increased. E damage increased.
Kassadin has been a bit stagnant and below where we'd like him to be for resting win-rate, and his pick-rate is similarly declining. We're looking to enhance some of his late game damage output to encourage the high risk/high reward scaling playstyle that his players enjoy.
Q - Null Sphere
Damage: 65 / 95 / 125 / 155 / 185 (+ 60% AP) → 65 / 95 / 125 / 155 / 185 (+ 70% AP)
E - Force Pulse
Damage: 70 / 100 / 130 / 160 / 190 (+ 65% AP) → 70 / 100 / 130 / 160 / 190 (+ 70% AP)
CHANGEDKaynQ and W mana costs decreased.
There are a decent number of lane Kayn (Layn) players out there and we'd like to give them a fair shot at winning their games. To do that without buffing Jayn (jungle Kayn), we're buffing mana costs to give him better access to wave clear and scrapping with his lane opponent.
Q - Reaping Slash
Mana Cost: 50 → 40
W - Blade's Reach
Mana Cost: 60 / 65 / 70 / 75 /80 → 40 / 45 / 50 / 55 / 60
BUFFEDKog'MawQ damage increased. W damage increased. R damage increased at higher ranks.
Seasons ago, The Mouth of the Abyss was once a viable and common mid lane poke champion who had a late-game powerhouse identity. He's not too far off from it these days, so we're looking to give him a bit of power to enable it again and get people to try it out without making bot lane shift to AP for trivial wave clear.
Q - Caustic Spittle
Damage: 80 / 125 / 170 / 215 / 260 (+ 80% AP) → 80 / 125 / 170 / 215 / 260 (+ 90% AP) W - Bio-Arcane Barrage
Q - Caustic Spittle
Damage On-Hit: 3 / 3.75 / 4.5 / 5.25 / 6% (+ 1% per 100 AP) target max HP → 3 / 3.75 / 4.5 / 5.25 / 6% (+ 1.5% per 100 AP) target max HP R - Living Artillery
Q - Caustic Spittle
Minimum Damage: 100 / 140 / 180 (+75% bonus AD) (+ 35% AP) → 100 / 140 / 180 (+75% bonus AD) (+ 35 / 40 / 45% AP)
Q - Caustic Spittle
Maximum damage is still doubled
CHANGEDMaster YiBase Health decreased. Q damage decreased.
Our fixes for Master Yi Q applying Kraken and Terminus were understandably buffs to Yi. We're looking to reduce his built in on-hit build potency now that the system works in his favor and make his early game more exploitable in order to bring him down to size.
Q - Alpha Strike
On-hit damage modifier: 75% → 65%
BUFFEDMiss FortuneBase AD increased.
If only there was a word to describe Miss Fortune's current state. Hmm, yeah.. can't really think of one. Anyway, we're buffing her this patch to bring her up to pace with the rest of the pack.
CHANGEDMorganaW mana cost decreased at higher ranks. W damage increased at lower ranks.
Last patch gave us a clean read on how much power each role got from making Morgana's W damage more consistent. With that dust settled, we're here to revisit her with some directly power-positive buffs, giving her better early fighting and making late-laning wave clear less punishing.
W - Tormented Shadow
Mana Cost: 70 / 85 / 100 / 115 / 130 → 70 / 80 / 90 / 100 / 110
W - Tormented Shadow
Minimum Damage Per Second: 14 / 28 / 42 / 56 / 70 → 18 / 31 / 44 / 57 / 70
BUFFEDNilahQ secondary monster damage increased.
Nilah will not become a viable jungler with this change but the current restriction around how little splash damage she deals to jungle monsters just isn't needed. We're removing this unneeded mod for now and eventually we may dive into what it would take for Nilah to be functional here.
Q - Formless Blade
Secondary damage to monsters: 10% total AD → 100% total AD
NERFEDRumblePassive damage decreased. Q damage decreased at higher ranks.
Rumble has climbed greatly in win rate since the consistency changes we made last patch, so we're moving some power out of Flamespitter and Junkyard Titan's damage output.
Passive - Junkyard Titan
Overheated Damage: 5-40 (+ 25% AP) + 5% target max HP → 5-40 (+ 25% AP)(+ 4% target max HP)
Q - Flamespitter
Damage Over 3 Seconds: 60 / 90 / 120 / 150 / 180 (+ 100% AP) + 6 / 6.5 / 7 / 7.5 / 8% target max HP → 60 / 85 / 110 / 135 / 160 (+ 100% AP) + 6 / 6.5 / 7 / 7.5 / 8% target max HP
BUFFEDSennaAttack Speed Growth increased. Q heal increased.
Senna is currently underperforming as a bot laner and even more so as a support. We're giving back some of the attack speed growth she's had previously to improve the feel of her attacking builds, and she's getting a small bump in her Q's base healing.
Q - Piercing Darkness
Heal: 40 / 55 / 70 / 85 / 100 (+ 40% bonus AD) (+ 50% AP) → 40 / 60 / 80 / 100 / 120 (+ 40% bonus AD) (+ 50% AP)
BUFFEDSettE monster damage increased.
Sett jungle is a lot closer to viable than people realize but still needs a bit of a push to reach true viability. Have fun!
E - Facebreaker
Bonus Monster Damage: 100 → 125-250 (based on level)
CHANGEDSingedQ damage per application decreased.
Singed underwent several changes last patch that made red side Singed deal his first tick of damage instantly instead of 0.25s late and made blue side Singed refresh his poison much more reliably. The net result of these changes is that in almost all cases, Singed players are dealing substantially more damage in almost all contexts. We're making some under the hood changes to poison duration in order to make the average Poison Trail closer to before, but without the substantial red-blue differences.
Q - Poison Trail
Duration: 2.2s → 2s
Q - Poison Trail
Max damage ticks per application: 9 → 8
BUFFEDTeemoMushrooms (and eggs and other objects) are now more visible.
We're making a small visual change to make Teemo's traps easier to pick out in the world. They still turn invisible and work mechanically identically before, but now they're just more opaque so you can tell what it is right before it blows up in your face.
R - Noxious Trap
Trap Opacity: 30% → 50%
BUFFEDVayneW monster damage increased.
Vayne jungle is a lot closer to viable than people realize but many players completely miss the mark on ability orders. If you want to play Vayne jungle, start with Silver Bolts and then max Tumble. Have fun!
W - Silver Bolts
Monster Damage: 6 / 7 / 8 / 9 / 10% max HP, capped at 200 → 140 / 155 / 170 / 185 / 200 damage regardless of health
NERFEDYunaraFixed several bugs that could cause Yunara to deal more or less damage with on-hit effects.
As players have gotten better at her, Yunara has risen to be one of the most potent ADCs in the game. We've got several bug fixes in this patch that we expect will nerf her popular Kraken Slayer + Hurricane build. We'll continue to keep an eye on her performance metrics to see how she lands after these changes.
Q - Cultivation of Spirit
Fixed a bug where sometimes the bounce could trigger multiple stacks per bounce for some items. It's intended for Yunara to build 1 stack per bounce.
Q - Cultivation of Spirit
Fixed an issue where sometimes items would fail to do damage on Q bounces in situations where a significant number of bounces were taking place. (The poros on the calculators behind the scenes are ready now)
Q - Cultivation of Spirit
Fixed an issue where items like Runnan's Hurricane were dealing full on-hit damage when bouncing from the secondary target to the primary target, triggering the full-on hit value multiple times in a single auto.
Q - Cultivation of Spirit
Fixed an issue where Runnan's Hurricane bolts were having their on-hit damage reduced incorrectly and will now apply the full on-hit damage correctly.