LoL Patch 15.12 Buffs and Nerfs: Every Champion Change
Archive note: patch 15.12 came out in June 2025, and League of Legends is on patch 26.22 now. Strong picks today? See our current-patch tier list or the official Riot patch notes.
Patch 15.12, or 25.12 in Riot’s own naming, went out with official notes on June 10, 2025, ahead of MSI. It buffed 15 champions, including Aurora, Twisted Fate, Lee Sin and Zeri, nerfed 11 more such as Ahri, Azir, Gwen and Rumble, updated Rammus, and opened the Hall of Legends event for Uzi.
When did patch 15.12 come out?
Riot published the notes on June 10, 2025. Seven new skins became available on June 11, 2025 at 19:00 UTC: Risen Legend Vayne, Risen Legend Kai’Sa, Immortalized Legend Kai’Sa and four Inkshadow skins.
A quick word on the number. Riot switched to year-based names in 2025, so the official page says “Patch 25.12” while the game files and most fan sites kept calling it 15.12. Same patch.
Which champions were buffed in patch 15.12?
The buffs were openly pro-skewed. Riot wrote that it was “getting things ready for MSI,” and a lot of the changes aimed at champions that rarely made it onto the stage.
| Champion | What changed |
|---|---|
| Aatrox | Passive healing vs champions 80% to 100%, E healing ratio up |
| Aphelios | Level 1 attack speed .640 to .665, Severum move speed 20% to 25%, Calibrum Moonshot base damage 60 to 70 |
| Aurora | Base MR 30 to 32, R ratio 60% to 70% AP |
| Bard | Base move speed 330 to 335 |
| Bel’Veth | R cast range now matches her E attack range |
| Garen | E scales harder with AD (a buff past 100 total AD) |
| Jax | Passive attack speed per stack up 1.5 points at every level |
| LeBlanc | E ratio 80% to 85% AP, R cooldown 50/40/30 to 45/35/25 |
| Lee Sin | E cooldown 9 to 8 seconds, slow reshaped to 35-75% |
| Mordekaiser | Q damage up to 80/115/150/185/220 |
| Nidalee | Cougar E ratio 40% to 55% AP |
| Samira | Faster early passive stacks, Q base damage up by 5 |
| Twisted Fate | E attack speed up 5 points, R cooldown 180/150/120 to 160/130/100 |
| Zeri | R damage 175/275/375 to 200/300/400, chain lightning 30% to 40% AD |
To be fair, Twisted Fate is the fun one here. Riot said he’d had “very low presence in all levels of play this year” and paired the buff with recent Unsealed Spellbook changes, hoping pro teams would try him again.
Which champions were nerfed?
Eleven champions lost power. Most were either pro staples (Ahri, Azir, Kalista, Varus) or solo queue top laners that had gotten out of hand (Gwen, Rumble, Shen).
| Champion | What changed |
|---|---|
| Ahri | Charm duration 2 to 1.8 seconds at max rank, R cooldown 130/115/100 to 140/120/100 |
| Azir | Move speed 335 to 330, attack speed per level 6% to 5.5% |
| Gwen | Base health 620 to 600, W cooldown longer at early ranks |
| Kalista | Base health 580 to 560, Q cooldown 8 to 9 seconds |
| Neeko | Q and W damage lower at early ranks |
| Rumble | Q max health damage capped at 8%, E slows lower |
| Senna | Soul drop chance per minion kill 14% to 10% |
| Shen | E ratio 15% to 11% bonus HP |
| Taliyah | Base MR 30 to 28, empowered Q 190% to 180% |
| Varus | Base armor 27 to 24 |
| Yorick | Q damage 30-130 to 30-110, Mist Walker attack speed reworked |
Vi sat in between. Her W and E were reshuffled to fix an odd skill order, with less W max health damage and more E damage, so whether she came out ahead depended on how you leveled her.
What happened to Rammus?
He got the biggest change of the patch, a full update of every ability. Spiked Shell no longer dealt magic damage on hit; instead Rammus gained 15% of his total armor and MR as bonus AD. Base AD went from 55 to 65, base armor from 40 to 35, and Defensive Ball Curl lasted 7 seconds with equal flat armor and MR, so he finally worked against magic damage autos too. His E lost its attack speed and started damaging monsters on cast. Soaring Slam hit harder up front, 150/250/350 instead of 100/175/250, but lost its aftershocks and stacking slow. Long story short, Riot traded his slow, grindy jungle clear for a cleaner tank kit. Want his current matchups? Our Rammus counters guide has them.
Runes, items and objectives
Grasp of the Undying took a big hit for ranged champions: effectiveness 60% to 40%. Riot was blunt. The team said they were “pretty unhappy” when Grasp decided ranged-vs-melee lanes.
Fair enough.
Atakhan’s spawn logic was retuned because he showed up in the bot lane too often compared to top. Dragons also got a long-standing bug fixed, so their basic attacks now triggered on-hit effects and respected dodge (which mattered for Thornmail, Rammus W and Jax).
Did the patch 15.12 leaks match the real notes?
Mostly, yes. An earlier version of this page listed the leaked champion names before release, and the real notes confirmed every leaked nerf: Ahri, Azir, Gwen, Kalista, Neeko, Rumble, Senna, Taliyah, Varus and Yorick. On the buff side, 12 of the 13 leaked names were right. Yasuo was the miss; the official notes had no Yasuo change at all.
What did the leaks leave out? Zeri’s buff, Shen’s nerf, the Vi adjustment, and the whole Rammus update. That’s the usual pattern, honestly: leaked lists tend to be early drafts, and the final notes change some numbers and add a few names.
ARAM, Brawl and other changes
ARAM got small balance tweaks. Kayn’s Q ratio went from 85% to 95% bonus AD with a 7-second Shadow Assassin E, Kennen’s damage dealt dropped to 100%, Sion’s W health per takedown fell from 8 to 5, Exhaust’s cooldown rose from 140 to 170 seconds with ARAM haste, and Blade of the Ruined King dealt 12/10% current health there instead of 10/8%.
Brawl sped up, put simply. Passive gold went from 65 to 75 per 10 seconds, rising to 100 after 5 minutes, and passive XP went from 20 to 30 per 10 seconds after 5 minutes. Bandle Juices (with hats, of course) appeared in the shop after level 16.
Outside the Rift, the Hall of Legends pass for Uzi had 100 levels of rewards, and the MSI Clash Cup ran on June 21 and 22 with registration from June 16. Swiftplay also gained position binding in champ select.
Is any of this still relevant?
Not for balance. In practice, a year and a half of patches has moved most of these numbers again.
So why keep the page? Because people still search for what changed in a specific patch, and a correct record of patch 15.12 beats a leaked list. If you want to compare it with a 2024 patch, our patch 14.22 archive has the same format, and if you’re starting fresh, a ranked ready League account from us drops you straight into the current patch.
FAQ
When was patch 15.12 released?
Riot published the patch notes on June 10, 2025. The patch skins became available on June 11, 2025 at 19:00 UTC.
Is patch 15.12 the same as patch 25.12?
Yes. Riot named its 2025 patches after the year, so the official notes say 25.12, while the game version and many fan sites used 15.12.
Which champions were buffed?
Aatrox, Aphelios, Aurora, Bard, Bel’Veth, Garen, Jax, LeBlanc, Lee Sin, Mordekaiser, Nidalee, Samira, Twisted Fate and Zeri, with Rammus getting a full update.
Which champions were nerfed in patch 15.12?
Ahri, Azir, Gwen, Kalista, Neeko, Rumble, Senna, Shen, Taliyah, Varus and Yorick. Vi had her W and E damage reshuffled.
Was Yasuo buffed in that patch?
No. Yasuo appeared on a leaked buff list, but the official notes contained no Yasuo changes.
What happened to Grasp of the Undying in 15.12?
In patch 15.12 its effectiveness on ranged champions dropped from 60% to 40%, because Riot did not want the rune to decide ranged-versus-melee lanes.
