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.
Janna's at her strongest when buffing another ally. If you can harass her ally, it will weaken her ability to fight you.
Save an interrupt ability for when Janna uses her ultimate.
Listen for the charge up sound on Howling Gale in case Janna is trying to hit you with it from off screen or from brush.
The stat comparisons provided here emphasize several important Cassiopeia against Janna counter statistics that may help you interpret the differences and similarities between this set of champs. Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Janna’s KDA ratio of NaN, highlighting that Cassiopeia may be more central to her team's team fighting potential than Janna. This observation is largely fueled by the difference in kills.
Cassiopeia typically has a much larger longest kill spree than her enemy does. On average, she takes more damage than Janna. This is usually reflective of differing health capacities; however, it can also imply that the one champ has less mobility and thus is not able to flee from additional harm when engaged or poked.
Both League of Legends champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Cassiopeia usually loses when taking on Janna, with a 47.8% win rate. As a result, Cassiopeia makes a bad counter for Janna.
While Cassiopeia does have a lower win rate compared to Janna, when facing one another, Cassiopeia also has a much greater level of difficulty that makes her a more difficult champion to pick up and master. You should expect to face a difficult match when picking Cassiopeia into Jannaas her relative depth means that you may not be able to reach her full potential without a lot of practice beforehand.
Furthermore, Cassiopeia also has a good amount of utility and CC, a similar amount to Janna. This often makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there isn't one best champion overall in League of Legends, in Cassiopeia vs Janna matchups, Janna is the better champion with a lower 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 trash counter to Janna. You will do well by focussing your play on increasing your gold income and destroying objectives. If you can do that, you should hold your own as Cassiopeia against Janna.
To truly master Cassiopeia in order to counter Janna during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tips and tricks for this matchup. If you listen to the build and suggestions shown above, you should increase your win rate significantly and be closer to League of Legends pro players.
Cassiopeia typically accumulates much more CS as Janna. Champs who typically don't get many minion kills usualy don't have to have much CS to be valuable teammates, such as support champions. They are able to scale well off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically have to have many items to be effective. In either case, try to surpass the values shown here to do well.
The most important items to have in your Cassiopeia versus Janna build consist of Seraph's Embrace, Cosmic Drive, and Liandry's Torment. When Cassiopeia combined at least these three pieces in her build, she performed much better countering Janna than with most other typical item sets. In fact, Cassiopeia had an average win rate of 47.8% when playing against Janna with this build.
To have the best chance of coming out on top against Janna as Cassiopeia, Cassiopeia players should use the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Manaflow Band, and Transcendence runes from the Precision and Sorcery rune sets. Of all the runes players picked for Cassiopeia vs Janna battles, this composite of runes yielded the best win rate. Moreover, these runes averaged a 47.8% win rate overall.
By default, tips, statistics, and builds on how to beat Janna as Cassiopeia are given for all ranked divisions. To filter the statistics and builds to an individual skill level, you may use the selection menu located above.