“Before shipping, we took the deliberate approach of not over-nerfing Janna considering that we were working on reshaping Ardent Censer in parallel to her kit changes,” Rioter Maple Nectar wrote in a dev corner post discussing the change. “We judged that a world where both her and the item were nerfed substantially to be a worse world, and planned our changes to that. At the end of the day, we concluded that she had the potential to be strong on release, but firmly believed that when properly tuned, the direction of this new play pattern would result in a Janna that was healthier for League. In light of that, we made plans to quickly follow up based on her day one metrics if need be, which is why we’ve pushed out our balance hotfix to her today. We’ll also continue to be pay attention to both to her and Ardent Censer closely for the new few weeks.”
The hotfix reduced her base movement sped from 335 to 320, reduced her base health from 525 to 500, reduced her base mana from 409.52 to 350, and increased the mana cost of her W by 10 points at all ranks.
The recent update to Janna came with the goal of giving her some more skill expression to encourage more active play while also addressing her increased popularity — aided by her synergy with the support item Ardent Censer. Her early game will likely suffer a bit, meaning she’s still a bit over-tuned. Ardent Censer also received a change in Patch 7.19, but it remains to be seen if it’ll be any less popular than it used to be.