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 stat comparisons provided here underscore some significant Cassiopeia against Sion matchup stats that may help us appreciate the distinctions between the pair. For instance, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is better than Sion’s KDA ratio of NaN, highlighting that Cassiopeia may be more central to her team's team fighting potential than Sion. This observation is largely a result of the difference in kills.
Cassiopeia often has a slightly larger longest killing spree than her counter does. On average, she takes less damage than Sion. This commonly reflects differing health capacities, yet it can also hint that the one champ has less mobility and thus is not able to kite away from additional damage when poked or engaged.
Both League of Legends champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Cassiopeia usually wins when trying to fight Sion, with a 53.7% win rate. Therefore, Cassiopeia makes a great counter to Sion.
While Cassiopeia does have a higher win rate compared to Sion, when facing one another, Cassiopeia also has a much greater learning curve that makes her a more challenging character to develop with. You don't need to be too worried when picking Cassiopeia into Sionas her relative depth means that you may not be able to unleash her full potential without a lot of practice beforehand.
Furthermore, Cassiopeia has a good amount of utility and CC, a similar amount to Sion. This makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there isn't a single best champion for every situation in League of Legends, in Cassiopeia vs Sion matchups, Cassiopeia is the better champ with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your teammates during teamfights.
Cassiopeia is a great counter to Sion. Focus your gameplay on keeping up your CS and destroying objectives. If you are able to do that, you should do very well as Cassiopeia against Sion.
If you would like to truly master Cassiopeia in order to counter Sion during both the laning and mid / late game phases of League of Legends, you should continue reading to learn a few extra tricks and insights into this matchup. If you mind the build and suggestions presented here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Cassiopeia often picks up a similar amount of CS as Sion. Champions who typically don't get much CS often don't need much CS to be valuable teammates, such as support champions. These kinds of champions are capable of scaling well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have several high cost items to be effective. In either situation, try to do better than the values displayed on this page to do well.
The best items to prioritize in your Cassiopeia versus Sion build consist of Liandry's Anguish, Seraph's Embrace, and Demonic Embrace. When Cassiopeia used at least these three items in her build, she performed significantly better countering Sion than with most other commonly used builds. In fact, Cassiopeia boasted an average win rate of 53.7% when countering Sion with these items in her kit.
To have the best probability of annihilating Sion as Cassiopeia, you should equip the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Conditioning, and Overgrowth runes from the Precision and Resolve rune sets. Out of all the rune builds that we analyzed for Cassiopeia vs Sion battles, this mix of runes resulted in the best win rate. Notably, these runes averaged a 53.7% win rate overall.
By default, tips, statistics, and builds on how to beat Sion as Cassiopeia are given for all skill levels, merged. To filter the stats and builds to a specific rank, you can use the selection menu located above.