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

Champions

Cassiopeia

• Q AP scaling over 3s:  70% --> 65%
• W AP scaling per second:  15% --> 10%

Evelynn

• E base damage (unempowered):  55-115 --> 60-180
• E base damage (empowered):  75-175 --> 80-240

Galio

• base HP:  632 --> 600

Jax

• HP growth:  100 --> 103
• base MP5:  7.6 --> 8.2
• R passive base damage:  70 / 120 / 170  -->  75 / 130 / 185

Jayce

• hammer Q damage:
  • base:  60-310 --> 60-285
  • bAD scaling:  120% --> 135%
• hammer W base damage over 4s:  160-460 --> 140-440
• hammer R damage:
  • base:  25 / 65 / 105 / 145 @ 1 / 6 / 11 / 16  -->  25 / 60 / 95 / 130 @ 1 / 6 / 11 / 16
  • bAD scaling:  25% --> 30%
• cannon Q damage:
  • base:  60-335 --> 60-310
  • bAD scaling:  125% --> 140%
  • EQ damage is still x1.4 these values

Kayn

• Q base damage per hit:  75-155 --> 75-175
  • this only applies to base form and blue form, not red form

Miss Fortune

• armor:  28 +4.2  -->  25 +4.0

Nasus

• P lifesteal:  9% / 15% / 21% @ 1 / 7 / 13  -->  12% / 18% / 24% @ 1 / 7 / 13

Quinn

• W AS:  28%-60% --> 28%-80%

Rakan

• W cooldown:  16s-10s --> 14s-10s
• E cooldown:  16s-12s --> 20s-12s (revert to live)

Rell

• base HP:  640 --> 620
• armor growth:  4.3 --> 4.0

Skarner

• armor growth:  4.8 --> 4.5
• E stun duration:  1.5s --> 1.1s

Swain

• see other changes here
• E AP scaling:  60% --> 70%

Teemo

• E onhit base damage:  14-66 --> 9-65

Thresh

• these are different from the patch preview (buffs to base HP and E passive damage instead of base armor and Q damage)
• base HP:  600 --> 620
• E max passive damage:
  • damage per P soul:  1.5 --> 1.7
  • tAD scaling:  80%-200% --> 90%-210%

Varus

• P AS cap:  3.0 --> 3.33

Viego

• base AD:  60 --> 57

Wukong

• W cooldown:  18s-14s --> 20s-16s
• E bAS:  40%-60% --> 35%-55%

Items

Bloodsong

• damage amp:
  • melee:  10% --> 8%
  • ranged:  5% (unchanged)
• duration:  6s --> 4s

Zaz'Zak's Realmpsike

• AP scaling:  20% --> 15%

Systems

• the new 3.0 AS cap is now active in all modes except Tutorials (and URF/Arena which use their own caps)
• turret fortification damage reduction:  80% --> 50% (revert to live)
• Cloud Soul speed:  20% --> 15%
• Chemtech Soul damage amp/reduction:  11% --> 13%
• Voracious Atakhan revive duration:  5.5s --> 15s
• Grubs damage per stack/second:  4 melee, 2 ranged  -->  3 melee, 1.5 ranged

ARAM ONLY

Sett

• Q speed:  35% --> 30% (same as SR)
  • this is a partial revert of the 15.2 changes

Zilean

• see other changes here
• W cooldown:
  • live:  14s-6s (same as SR)
  • old:  12s-5s
  • new:  13s-5s
  • this fixes a non-linear scaling from the previous values (-2s for ranks 2-4 but -1s for rank 5)
• R AP scaling:
  • live:  200% (same as SR)
  • old:  215%
  • new:  250%

URF ONLY

Dark Seal

• stacks gained per kill:  2 (same as SR) --> 1
• stacks gained per assist:  1 (unchanged, same as SR)
• stacks lost per death:  5 (same as SR) --> 3

Mejai's Soulstealer

• stacks gained per kill:  4 (same as SR) --> 2
• stacks gained per assist:  2 (same as SR) --> 1
• stacks lost per death:  10 (same as SR) --> 5

Cull

• minion kills:  100 --> 50
  • I'm not sure if this is meant to be a buff or a nerf
  • while it does let the +350g trigger sooner, you also lose 50g in the process from the minion kills
  • they should probably also change it to +2 gold per minion kill to offset this if a nerf wasn't intended?

Heartsteel

• per-target cooldown:  40s --> 30s (same as SR)

SWIFTPLAY ONLY

Fiddlesticks

• W pre-mit healing vs champions:  25%-55% (same as SR) --> 35%-65%
• E slow:  30%-50% (same as SR) --> 40%-60%

Ivern

• E shield AP scaling:  50% (same as SR) --> 60%
• E base damage:  70-150 (same as SR) --> 70-190

Nidalee

• these are slightly different from the patch preview (stronger health growth buff and no MR growth buff)
• HP growth:  109 (same as SR) --> 124
• Q min damage:
  • base:  70-150 (same as SR) --> 70-170
  • AP scaling:  50% (same as SR) --> 55%
  • max damage is still x3.0 these values

Yorick

• ghoul/maiden damage to turrets:  x0.5 (same as SR) --> x0.7

Zoe

• E base damage:  70-230 (same as SR) --> 85-245
  • unsure if this properly applies to the wakeup damage cap or just the initial impact damage (there are multiple sets of values for each)
• E cooldown:  16s-12s (same as SR) --> 14s-12s

Changes from previous days

See here.