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.
The stats provided here clarify some critical Cassiopeia vs. Rell matchup statistics that may help you distinguish the differences and similarities between the two. As an example, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is better than Rell’s ratio of NaN, indicating that Cassiopeia may be more central to her team's team fighting effectiveness than Rell. This observation is largely caused by the difference in kills.
Cassiopeia normally has a much larger longest killing spree than her matchup does. Commonly, she receives a similar amount of damage to Rell. This often reflects differing health capacities; however, it can also indicate that the champion with more HP has less mobility and thus is not able to escape additional harm when engaged or poked.
Both League champions are great champions. Both champs have their strengths, weaknesses, and counters. In League's current meta, Cassiopeia usually wins when facing off against Rell, with a 54.1% win rate. Therefore, Cassiopeia makes a great counter for Rell.
While Cassiopeia does have a much higher winrate than Rell, when they face off with one another, Cassiopeia also has a much greater learning curve that makes her a more difficult character to learn and master. You don't need to be too worried when picking Cassiopeia into Rellas her relative depth means that you may not be able to unleash her full potential without a lot of practice beforehand.
Additionally, Cassiopeia has a good amount of utility and CC, a similar amount to Rell. This makes her just as valuable during team fights, especially when fighting champions with a ton of burst damage.
While there is not a single best champion for every situation in League of Legends, in Cassiopeia vs Rell 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 team members during late stage team fights.
Cassiopeia is a great counter for Rell. You will do well by focussing your strategy on keeping up your gold income and taking out objectives. If you are able to do that, you should do very well as Cassiopeia against Rell.
To truly master Cassiopeia in order to counter Rell during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you pay attention to the build and suggestions presented here, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Cassiopeia usually picks up much more CS as Rell. Champions who typically don't get many minion kills usualy don't require much CS to be effective, such as support champions. These kinds of champions are able to scale properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically have to have several high cost items to be effective. In either situation, try to surpass the values reported on this page to do well.
The most crucial items to use in your Cassiopeia versus Rell build include Liandry's Anguish, Seraph's Embrace, and Rylai's Crystal Scepter. When Cassiopeia included at least these three items in her build, she performed a lot better vs. Rell than with many other commonly used counter builds. In fact, Cassiopeia boasted an average winrate of 54.1% when playing against Rell with this counter build.
To have the highest likelihood of beating Rell as Cassiopeia, you should use the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Conditioning, and Overgrowth runes from the Precision and Resolve rune sets. Of all the rune builds players chose for Cassiopeia vs Rell fights, this composite of runes resulted in the greatest win rate. Notably, these runes gave a 54.1% win rate overall.
By default, tips, statistics, and builds on how to beat Rell as Cassiopeia are shown for every ranked division. To narrow the stats and builds to an individual skill level, you can use the selection menu earlier in the counter matchup guide.