Kassadin's ultimate has many uses and is on a shorter cooldown than most, use it often.
Kassadin has multiple item paths; he can go caster via Mana and Ability Power or anti-caster with Cooldown Reduction and Magic Resist.
Try to get the Ancient Golem buff to counteract Riftwalk's increasing Mana cost.
When Rek'Sai is near, she can see the position of you and your allies, but only if you're moving.
If you see one of Rek'Sai's tunnels, briefly stand on one of the entrances to destroy it.
Rek'Sai's Furious Bite gains damage as she builds Fury. Be very careful around her when her Fury is full.
The stat comparisons provided here emphasize some vital Kassadin versus Rek'Sai counter statistics that may help you appreciate the distinctions between the pair. Kassadin’s KDA ratio ([kills + assists] / deaths) of NaN is better than Rek'Sai’s ratio of NaN, indicating that Kassadin may be more central to his team's team fighting capacity than Rek'Sai..
Kassadin usually has a similar longest killing spree as his matchup does. Commonly, he receives less damage than Rek'Sai. This is usually reflective of differing health capacities; however, it can also indicate that the champion with higher HP has less agility and thus is not able to escape additional damage when engaged or poked.
Both League of Legends champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Kassadin usually loses when facing off against Rek'Sai, with a 48.3% win rate. Therefore, Kassadin makes a poor counter to Rek'Sai.
While Kassadin does have a lower winrate than Rek'Sai, when on opposite teams, Kassadin also has a much greater level of difficulty that makes him a more time consuming champion to pick up and master. You still need to be cautious when picking Kassadin into Rek'Saias his relative depth means that you may not be able to reach his full potential without a significant amount of practice beforehand.
Moreover, Kassadin has some amount of CC and other utility, a similar amount to Rek'Sai. This makes her just as valuable during teamfights, especially when trying to counter champions with a lot of burst damage.
While there isn't a single best champion in League of Legends, in Kassadin vs Rek'Sai matchups, Rek'Sai is the better champ with a lower win rate, more champion depth, and a similar amount of utility to help out your teammates during late stage team fights.
Kassadin is a somewhat poor counter for Rek'Sai. Make sure you focus your strategy on maximizing your CS and taking out objectives. If you are able to do that, you should hold your own as Kassadin against Rek'Sai.
To truly master Kassadin in order to counter Rek'Sai during both the lane and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you listen to the build and stats shown here, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Kassadin typically racks up much more CS as Rek'Sai. Champs who on average don't take many minion kills typically don't need much CS to be valuable teammates, such as supports. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often need many items to be effective. In either case, try to exceed the numbers displayed on this page to do well.
The ideal items to focus on in your Kassadin versus Rek'Sai build consist of Seraph's Embrace, Malignance, and Rod of Ages. When Kassadin bought at least these three pieces in his build, he performed significantly better versus Rek'Sai than with most other typical item sets. In fact, Kassadin boasted an average win rate of 48.3% battling Rek'Sai with this build.
To have the greatest likelihood of beating Rek'Sai as Kassadin, Kassadin players should take the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the runes we have analyed for Kassadin vs Rek'Sai counters, this combo of runes yielded the best win rate. Moreover, these runes provided a 48.3% win rate overall.
If you want to view Kassadin versus Rek'Sai tips and builds for a a distinct division, feel free to select one from the selection menu displayed above. By default, the stats and build suggestions given are computed using all games finished with both champions.