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.
Take advantage of Flurry by weaving in basic attacks between spell casts - this maximizes damage output and minimizes Energy loss.
Self-casting Safeguard and using Iron Will are powerful tools for killing neutral monsters (in the jungle).
Use Sonic Wave before Dragon's Rage so you can chase the target with Resonating Strike.
The Kassadin Lee Sin synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Lee Sin, 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 Lee Sin. His KDA worsened from NaN to NaN. This drop shows that Lee Sin helps Kassadin perform worse in ranked LoL rounds. Yet, the small difference proves that this performance change is only marginal.
When Kassadin plays on the same team as Lee Sin, he sees a little increase in his total damage output. This may demonstrate that Lee Sin provides cover for him to deal more damage or that his allyship also helps extend the round's duration. Similarly, when Kassadin is played alongside Lee Sin on the same side, he usually scores many fewer killing sprees than when he plays alone. This is contrasting evidence that he is worse when playing alongside Lee Sin.
Moreover, when Kassadin plays with Lee Sin on the same side, he often receives a little less damage than when he fights alone. Taking not as much damage may indicate that Lee Sin does a decent job of protecting Kassadin in team fights.
There is no universally accepted best companion for Kassadin that will no matter what be his ideal synergy. Yet, overall, Lee Sin is a very bad ally for Kassadin. By being on the same side as Kassadin, he lowers their win rate by -3.3% to 46.7%. This demonstrates that there is a very bad synergy between Kassadin and Lee Sin that results in them performing worse together than without each other.
Lee Sin has a lower difficulty than Kassadin. That means Kassadin players don't need to be careful when arranging Lee Sin teammates to play with, as they will have to have a relatively low level of skill to do well with you.
Fighting cooperatively, Kassadin players should see an overall large increase in your team’s capacity to destroy wih physical damage. Together, these two can tear through the other team with a lot of physcial damage.
Although, by aligning Kassadin and Lee Sin together, you will not be granting your team enough support. Make sure to pick other champs on your team that offsets this gap in this pairing's kit.
Regardless of your Lee Sin ally's ability, you should focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you follow these simple suggestions, you should do well anyway.
To truly master Kassadin in order to synergize with Lee Sin during both the lane and mid / late game phases of League, you should keep reading to pick up a few extra tips and tricks for this champion pairing. If you pay attention to the build and tips presented here, you should grow your win rate by a lot.
The most crucial items to build first in your Kassadin and Lee Sin synergy build include Rabadon's Deathcap, Malignance, and Rod of Ages. When Kassadin bought at least these three great items in his build, he did a lot better when fighting alongside Lee Sin than with most other common item sets. In fact, Kassadin had an average win rate of 46.7% when synergizing his build and playstyle to Lee Sin with these items in his kit.
To have the highest chance of annihilating your oponents, Kassadin players should equip 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 rune builds players chose for this champion pairing, this mixture of runes yielded the top win rate. In fact, these runes provided a 46.7% winrate overall.
If you want to see Kassadin and Lee Sin collaboration tips and builds for a a particular division, please choose one from the selection menu shown above. If viewing for the first time, the statistics and tips and suggestions given are calculated using all rounds finished with both champs.