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.
Picking up goo chunks is very important to staying alive.
When Cell Division is ready, try to die in a position that makes it difficult for the enemy team to kill your bloblets.
Charging Elastic Slingshot from the fog of war will give opponents less time to react.
The Kassadin Zac synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Zac, 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 very large drop in his KDA (ratio of kills and assists to deaths) when paired with Zac. His KDA fell from NaN to NaN. This fall shows that Zac helps Kassadin perform poorer in competitive LoL matches. Yet, the small difference shows that this performance change is not very impactful.
When Kassadin plays on the same team as Zac, he observes a marginal improvement in his complete damage dealt. This could indicate that Zac provides protection for him to deal more damage or that his presence on the team also helps extend the round's duration. Similarly, when Kassadin is played together with Zac on the same side, he usually scores many fewer killing sprees compared to when he plays without Zac. This is contrasting evidence that he is worse when playing synergisticly with Zac.
Moreover, when Kassadin plays with Zac on the same side, he usually receives a little more damage than when he plays alone. Getting dealt more damage could mean that Zac does a poor job of protecting Kassadin during team fights.
There is no perfect ally for Kassadin that will no matter what be his #1 synergy. Yet, overall, Zac is a pretty good teammate for Kassadin. By being on the same side as Kassadin, he increases their win rate by 2.4% to 52.4%. This demonstrates that there is a somewhat important strategic relationship between Kassadin and Zac that results in them performing at the top of their game together than without each other.
Zac has a lower difficulty than Kassadin. That means Kassadin players don't need to be very careful when lining up Zac allies to play with, as they will have to have a lower level of skill to cooperate well with you.
Playing cooperatively, you should observe an overall large increase in your team’s capacity to deal magical damage. When paired, these two are able to dish out a surprising amount of magic type damage.
Conversely, by bringing Kassadin and Zac together, you may not be giving your side enough anti-tank damage dealing potential. Plan to bring other champs on your team that helps cover this relative gap in this pairing's capabilities.
Regardless of your Zac ally's skill level, you need to focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you heed this simple advice, you will do well anyway.
To truly master Kassadin to synergize with Zac during both the laning and mid / late game phases of LoL games, you should continue reading to learn a few extra tricks and insights into this champion pairing. If you pay attention to the build and tips presented above, you should increase your win rate by a lot.
The ideal items to include in your Kassadin and Zac synergy build include Seraph's Embrace, Rabadon's Deathcap, and Malignance. When Kassadin bought at least these three finished items in his build, he performed much better when fighting alongside Zac than with most other commonly used builds. In fact, Kassadin had an average winrate of 52.4% helping carry Zac with these items in his kit.
To have the best chance of vanquishing your oponents, Kassadin players should equip the Fleet Footwork, Presence of Mind, Legend: Tenacity, Coup de Grace, Overgrowth, and Second Wind runes from the Precision and Resolve rune sets. Of all the runes players picked for this team composition, this combo of runes yielded the best win rate. Moreover, these runes gave a 52.4% winrate overall.
By default, tips, stats, and builds on how to team up Zac with Kassadin are given for all skill levels combined. To scope the statistics and builds to a particular skill level, you can use the selection menu located earlier on the page.