Gwen can still damage enemies outside her Hallowed Mists, especially with her Ultimate's range.
Some of Gwen's Abilities can apply her passive to multiple enemies, so aim them at groups to get maximum damage and healing.
Always be Attacking - In addition to dealing bonus damage, Gwen's Attacks empower or reset many of her Abilities.
It takes 6 spell casts for Kassadin's slow, Force Pulse, to become castable. If he levels up that ability, judiciously use your own skills while laning against him.
Kassadin deals mostly magic damage. If he's doing well consider buying magic resist items like Mercury's Treads and Banshee's Veil.
Each time Kassadin consecutively uses Riftwalk, he pays more and more mana. Keep this in mind as you chase him.
The stats shown here show some critical Gwen against Kassadin counter statistics that can help you interpret the distinctions between the pair. Gwen’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Kassadin’s KDA ratio of NaN, showing that Gwen may be more central to her team's team fighting potential than Kassadin..
Gwen typically has a slightly smaller longest kill spree than her counter does. On average, she receives a similar amount of damage to Kassadin. This is usually reflective of differing health capacities, but it can also show that the one champ has less mobility and thus is unable to escape additional harm when poked or engaged.
Both League champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Gwen usually loses when trying to fight Kassadin, with a 48.9% win rate. Thus, Gwen makes a bad counter for Kassadin.
While Gwen does have a lower winrate than Kassadin, when they face off with one another, Gwen also has a lower learning curve that makes her a less time consuming champ to pick up and master. You should be careful when picking Gwen into Kassadin.
Moreover, Gwen also has some amount of utility and CC, a similar amount to Kassadin. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there is not a single best champion for every situation in League of Legends, in Gwen vs Kassadin matchups, Kassadin is the better champion with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during late stage team fights.
Gwen is a somewhat poor counter to Kassadin. You will do well by focussing your gameplay on increasing your CS and destroying objectives. If you do that, you should do very well as Gwen against Kassadin.
If you would like to truly master Gwen to counter Kassadin during both the lane and mid / late game phases of League of Legends, you should continue reading to gather a few extra tricks and insights into this matchup. If you listen to the build and suggestions presented above, you should increase your win rate by a lot and be closer to League of Legends pro players.
Gwen often racks up a similar amount of CS relative to Kassadin. Champions who typically don't get much CS usualy don't need much CS to be effective, such as supports. These kinds of champions are capable of scaling properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often need several high cost items to be effective. In either situation, try to surpass the values displayed on this page to do well.
The most crucial items to have in your Gwen versus Kassadin build include Rabadon's Deathcap, Nashor's Tooth, and Riftmaker. When Gwen included at least these three pieces in her build, she did a lot better countering Kassadin than with most other typical counter builds. In fact, Gwen boasted an average winrate of 48.9% when playing against Kassadin with these items in her kit.
To have the best chance of vanquishing Kassadin as Gwen, Gwen players should use the Conqueror, Presence of Mind, Legend: Alacrity, Last Stand, Bone Plating, and Unflinching runes from the Precision and Resolve rune sets. Out of all the runes that we analyzed for Gwen vs Kassadin counters, this composite of runes resulted in the best win rate. Moreover, these runes provided a 48.9% win rate overall.
If you would like to see Gwen versus Kassadin tips and counter builds for a an individual rank, please choose one from the selection menu shown above. By default, the statistics and build suggestions given are computed using every match played with both champs.