Patch 12.18 is the 2022 Worlds patch planned to balance the final power picks with 100 percent presence rates in pro play. As a result, Kalista and Lulu were heavily targeted with nerfs to reduce their early-game lane oppression while still leaving room to showcase their skill and shine. While Lee Sin and Thresh, on the other hand, saw serious buffs that will definitely guarantee them a spot in the current pro-play meta that favors CC-heavy and durable champions.
Other than that, the devs addressed the rising power creep and early-game impact of Miss Fortune, Nocturne, Kayn, and Hecarim, making the lower-tier games seem one-sided. Patch 12.18 also adjusted Maokai and Udyr to give them more optimal build paths and versatility.