Here's the full 5.21 patch notes with an introduction by Scarizard:
Points of Interest from the 5.21 PBEHere's a brief look at a few of the new things included in patch 5.21, including things mentioned above in the patch notes and things discovered during the last PBE cycle! This coverage includes preview screen shots and video taken during the 5.21 PBE cycle and may vary from what is pushed to live.
Upcoming Champion SkinsPatch 5.20 is set to include THREE new champion skins - Slayer Jinx, Slayer Pantheon, and Zombie Nunu! We'll have a full preview up once these new skin is released and available for purchase.
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New Summoner Icons
5.21 also includes a few new summoner icons!
We also have four new summoner icons for the four teams headed into the 2015 World Championship semifinals.
[NOTE: Remember, according to this post: "Players who own the 2015 World Champions’ team icon before the start of Finals will be rewarded with a bonus winner’s icon after Worlds is over." - these should be for that as 5.21 will be the last patch to live before Worlds ends and assets need to be made before hand even though only ONE TEAM will get the extra winner's icon!! ]
New Login ThemesThis cycle includes two new login screens - one for the upcoming Zombie & Slayer skins and a second login for the World Championship!
Zombie Slayer LoginTo go along with the upcoming Slayer and Zombie skins, we have a ghoulish new login!
Here's the still image for the Zombie Slayer login:
Worlds LoginWe also have another WORLDS login, this time with a blue color scheme and the summoner's cup prominently displayed!
Kha'Zix Isolation indicators added.
To better match his Full Metal Kha'Zix skin, indicators for Kha'Zix's isolation mechanic have been added to his base skin and his Guardian of the Sands skin!
- To go with the SHADOW AND FORTUNE Harrowing story, several champions have received updates to their short form in-client lore - Hecarim, Kalista, Karthus, Mordekaiser, and Thresh
- Here's a look at the new report a player screen & options:
- As mentioned above, Zilean has a new passive in this patch! here's a few screen shots and a preview video: