General reminder that many changes cannot be easily datamined, such as functionality changes or bugfixes, and are not always final.

Champions

Akali

• W cooldown:  20s all ranks --> 20s-16s
• R1 damage:
  • base:  80 / 220 / 360  -->  110 / 220 / 330
  • AP scaling:  30% --> 25%
  • bAD scaling:  50% (unchanged)
• R2 damage:
  • base:  60 / 130 / 200  -->  70 / 140 / 210
  • AP scaling:  30% --> 25%
  • execute scaling:  up to x3.0 at 30% health (unchanged)
• R cooldown:  100s / 80s / 60s  -->  120s / 90s / 60s

Cassiopeia

• stats:
  • mana:  350 +60  -->  400 +40
• Q:
  • cost:  50-90 --> 50-70
  • AP scaling:  90% --> 80%
• W:
  • cost:  70-110 --> 70-90
• E:
  • cost:  50-42 --> 40 all ranks

Irelia

• base health:  590 --> 630
• base HP5:  8.5 --> 6.0
• P buff duration:  6s --> 5s

Yasuo

• E damage:
  • base:  60-100 --> 70-130
  • bAD scaling:  20% --> removed
  • AP scaling:  60% (unchanged)
  • bonus damage per cast:  15%-25% linear --> 25% all levels
    • max at 4 stacks:  60%-100% --> 100%

Yone

• Q damage:
  • base:  20-100 --> 20-120
  • tAD scaling:  105% --> 100%
  • crit modifier:  x0.9333 --> x0.88888
    • this stacks with his passive's x0.9 crit modifier, but not with his former 105% tAD scaling
    • this means total tAD scaling from crits is 147% (181% with iedge) --> 140% (172% with iedge)
• W shield duration:  1.5s --> 1.0s
• E cooldown:  22s-10s --> 18s-10s
• R cooldown:  120s / 90s / 60s  -->  120s / 100s / 80s

Zed

• Q damage:
  • base:  80-220 --> 80-240
  • bAD scaling:  110% --> 100%
• E damage:
  • base:  65-165 --> 60-180
  • bAD scaling:  65% --> 80%
• E cooldown:  5s-3s --> 4s all ranks
• E cost:  40 --> 50
• R cooldown:  120s / 100s / 80s  -->  120s / 110s / 100s

Items

Null-Magic Mantle

• cost:  450 --> 400
  • parent item total costs unchanged unless stated
• MR:  25 --> 20

Mercury's Treads

• cost:  1100 --> 1200
• MR:  25 --> 20

Plated Steelcaps

• cost:  1000 --> 1100
• armor:  25 --> 20
• passive block:  8% --> 10%

Ionian Boots of Lucidity

• cost:  900 --> 1000
• summoner haste:  12 --> 10

Sorcerer's Shoes

• mpen:  18 --> 15

Berserker's Greaves

• AS:  35% --> 30%

Boots of Swiftness

• cost:  900 --> 1000

Abyssal Mask

• MR shred:  20% --> 30%

Wit's End

• recipe:
  • old:  Recurve Bow + Negatron Cloak + Dagger + 900g  =  2800g
  • new:  Recurve Bow + Negatron Cloak + Recurve Bow + 500g  =  2800g
• onhit damage:  15-80 breakpoints 8-18  -->  40-80 linear 8-18
  • comparison here tldr starts higher but scales slower, buff through level 12, then a nerf until breaking even at 18