Welcome to patch 5.13, the super mega large one that has a lot of AP item changes and the new Devourer enchantment. Now, you might be thinking, "Huh, that's a very functional title and not at all very sleek," but we're here to communicate, not sell. Also, these changes are pretty exciting to the point where we think they don't need to be wrapped up in shiny titles. Just functional ones.
Laziness in patch titling aside, 5.13 is all about offering new choices for a broad swathe of players and champions alike. We've got a pretty large overhaul of AP items so that they're all offering real competition for purchase (rather than just the top 3 things that build out of Needlessly Large Rod), in addition to a brand new Devourer jungle enchantment, featuring Ghost Dog (you'll understand when you buy one).
Upon re-reading our introduction, it can seem like there are "only" two groups of changes, but once you get into the trenches you'll understand why this is a Pretty Big Patch(™). Hopefully this will also lead to a lot of cool experimentation in your games of League of Legends, and we genuinely apologize for anyone who runs into jungle Kayle with Devourer, because it's kind of gross."