Overabundance of slows and lack of counter-itemization
Need more (or at least 1 other) anti-slow item. No tenacity is not the same thing.
Typically when there’s a lot of slows, there’s also a lot of hard CC so you run mercs to counter the CC (and cuz mr) and can’t even consider swifties. But once you’re not CC’d you’re being slowed. Case and point: every Glacial augment user and every Rylais user and anyone else with a spammable or area-based slow in their kit.
######QSS/Cleanse isn’t the answer either, slows are typically either spammable abilities or applied repeatedly via rylais or are an area effect like glacial lasers.
This is targeted more at immobile champs who can’t just ignore slows with dashes and aren’t battlemages that can proc Phase Rush with ease from a distance repeatedly.
25% slow resistance isn't all that great, but you can have Celerity on top so you just flat out have more MS when you're slowed.