Lead your enemy when targeting with Noxious Blast to ensure the hit.
Use Twin Fang on poisoned stationary targets like monsters and units stunned by her Petrifying Gaze for maximum damage.
Use the time after Sion has died to reposition and prepare for his return.
Even if Sion still hits a Decimating Smash, making him release the charge earlier reduces its impact.
The stats provided here highlight several strategic Cassiopeia against Sion counter statistics that may help you distinguish the differences between the two. For instance, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sion’s ratio of NaN, indicating that Cassiopeia may be more central to her team's team fighting effectiveness than Sion..
Cassiopeia normally has a slightly larger longest kill spree than her matchup does. Typically, she receives less damage than Sion. This commonly reflects different amounts of tankyness, but it can also imply that the champion with increased health has less agility and thus is unable to escape additional damage when poked or engaged.
Both League of Legends champions are great champions. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Cassiopeia usually wins when playing against Sion, with a 53.0% win rate. Thus, Cassiopeia makes a good counter to Sion.
While Cassiopeia does have a higher win rate than Sion, when on opposite teams, Cassiopeia also has a much greater difficulty level that makes her a more complex character to learn. You should be be fine when picking Cassiopeia into Sionas her relative depth means that you may not be able to reach her full potential without a significant amount of practice beforehand.
Furthermore, Cassiopeia also has a good amount of utility and CC, a similar amount to Sion. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there is not a single best champion overall in League of Legends, in Cassiopeia vs Sion matchups, Cassiopeia is the better champion with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your teammates during team fights.
Cassiopeia is an above average counter for Sion. Focus your play on keeping up your gold income and destroying objectives. If you do that, you should be able to stand on your own as Cassiopeia against Sion.
To learn all of the intricacies of Cassiopeia to counter Sion during both the laning and mid / late game phases of League of Legends, you should keep reading to gather a few extra tricks and insights into this matchup. If you mind the build and tips displayed here, you should increase your win rate by a lot and be that much closer to League of Legends pro players.
Cassiopeia often racks up a similar amount of CS relative to Sion. Champions who on average don't take much CS usualy don't require much CS to be effective, such as support champions. They are able to scale well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, typically have to have a lot of items to be effective. In either case, try to do better than the values shown on this page to do well.
The most crucial items to use in your Cassiopeia versus Sion build consist of Seraph's Embrace, Rylai's Crystal Scepter, and Cosmic Drive. When Cassiopeia included at least these three items in her build, she performed significantly better vs. Sion than with most other common builds. In fact, Cassiopeia boasted an average winrate of 53.0% when playing against Sion with this counter build.
To have the highest probability of coming out on top against Sion as Cassiopeia, you should take the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Manaflow Band, and Transcendence runes from the Precision and Sorcery rune sets. Out of all the rune combinations that we analyzed for Cassiopeia vs Sion counter picks, this composite of runes resulted in the highest win rate. Moreover, these runes averaged a 53.0% win rate overall.
By default, tips, stats, and builds on how to beat Sion as Cassiopeia are presented for all ranked divisions combined. If you want to narrow the stats and builds to a particular skill level, you should use the selection menu above.