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.
Communication is key when making use of Thresh's lantern. Let your teammates know how you like to use it.
Death Sentence and Flay can be combined in either cast order for powerful combinations.
Thresh can collect souls without needing to kill units himself. Planning your map position to be near the most deaths will help to maximize soul collection.
The Kassadin Thresh synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Thresh, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Kassadin sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Thresh. His KDA decreased from NaN to NaN. This worsening shows that Thresh helps Kassadin perform poorer in competitive League of Legends matches. Yet, the small difference shows that this performance change is only marginal.
When Kassadin plays on the same team as Thresh, he gets a barely noticable drop in his total damage dealt. This change could demonstrate that Thresh doesn't help protection for him to deal more damage or that his participation also helps extend the match's duration. Similarly, when Kassadin is played with Thresh on the same side, he usually scores many fewer killing sprees than when he plays without Thresh. This is contrasting evidence that he is worse when playing synergisticly with Thresh.
Moreover, when Kassadin plays with Thresh on the same team, he typically receives a little less damage than when he plays alone. Getting dealt not as much damage may mean that Thresh does a decent job of protecting Kassadin during teamfights.
There is no universally accepted best ally for Kassadin that will 100% of the time be his ideal ally. Yet, Thresh is a below average ally for Kassadin. By playing on the same side as Kassadin, he lowers their win rate by -2.2% to 47.8%. This signals that there is a harmful bond between Kassadin and Thresh that allows them to perform not as well together than without each other.
Thresh has a lower difficulty than Kassadin. That means you don't need to be very careful when enlisting Thresh teammates to play with, as they will have to have a relatively low level of skill to play well with you.
When playing together, Kassadin players will likely witness an overall large increase in your team’s capability to deal magical damage. Together, these two are able to dish out a surprising amount of magic type damage.
Although, by pairing Kassadin and Thresh together, you probably will not be granting your side much attack damage. Plan to include other champs on your team that helps cover this relative gap in their playstyle.
Regardless of your Thresh ally's ability, you need to focus on maximizing your gold income, outlasting your enemies, and taking down objectives. If you follow these simple suggestions, you will do well anyway.
To truly master Kassadin to pair well with Thresh during both the laning and mid / late game phases of League rounds, you should continue reading to learn a few extra lessons on this champion pairing. If you mind the build and suggestions displayed here, you will grow your win rate by a lot.
The top items to include in your Kassadin and Thresh synergy build include Malignance, Zhonya's Hourglass, and Rod of Ages. When Kassadin used at least these three items in his build, he performed much better when paired up with Thresh than with most other commonly used builds. In fact, Kassadin had an average winrate of 47.8% when synergizing his build and playstyle to Thresh with this build.
To have the highest probability of crushing your oponents, you 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. Of all the rune builds players picked for Kassadin and Thresh pairings, this order of runes resulted in the best win rate. Notably, these runes averaged a 47.8% winrate overall.
By default, tips, stats, and builds on how to pair Thresh with Kassadin are displayed for all skill levels combined. If you would like to narrow the stats and builds to an individual player tier, you may use the selection menu earlier in the counter matchup guide.