@Riot -Why are you moving Ultimate Hat to Domination, and replacing it with Nimbus Cloak in Sorcery?
Ultimate Hat makes more sense in the Sorcery tree that mages are supposed to favor, as it's a low-key way to improve their damage output, while the new Nimbus Cloak (for those that don't know - gain MS for 2s when you cast your ultimate) makes a lot more sense in the Domination tree, as it favors assassins who like to get to their targets or escape after they roll their combos. I'm gathering that you don't like that Ultimate Hat + Transcendence are a thing together (since it's favorable towards supports, that you're trying to curb power from), but come on. You're not making sense here anymore. You have rune trees you've tried to define as being catered to certain classes and roles, but recent changes seem to be making changes that basically throw that logic out the window. If you wanted to curtail the combo between Ultimate Hat and Transcendence, remove the 10% CDR that Transcendence grants and just let it convert excess CDR into AP/AD. If you're trying to push that bruisers should take Sorcery for ... Phase Rush... Celerity, and Nimbus Cloak, just stop. They're all kind of awkward in this tree to begin with, and Phase Rush is so niche it may as well not exist. If you want a tree devoted to moving faster, just make a new one. You're blurring the lines a bit too much by trying to shove speed modifications and mage supplemental runes together in the same tree, and it's making the tree a complete mess. Split them up, focus them better, and give mages a tree that isn't bloated by runes that they won't be able to properly utilize.
As an aside - the tree is called Sorcery. Anyone who's familiar with anything fantasy immediately thinks of wizards and mages - not running faster. You need to solidify the themes and fantasies your runes are conveying.
EDIT: Sources: Here, lower in the page where it introduces Nimbus Cloak, then there's a header for Ultimate Hat, where it states it's removal from Sorcery.
There's a "Context" link below the header for Ultimate Hat leading to Ricklessabandon's Twitter.
which seemingly gets nerfed every single patch [aery,censer,shielding % on items, now ultimate hat, ap item changes]