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.
If you stun an enemy with Shocking Orb, follow up with a guaranteed center hit on Eye of Destruction.
It's easier to land Arcanopulse on an enemy when they're moving toward or away from you, rather than side to side.
Eye of Destruction will make landing Arcanopulse easier as the target will be slowed.
The Kassadin Xerath synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Xerath, 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 Xerath. His KDA went down from NaN to NaN. This negative change shows that Xerath helps Kassadin perform worse in competitive LoL matches. Yet, the small difference demonstrates that this performance change is not very impactful.
When Kassadin plays on the same team as Xerath, he observes a small decrease in his complete damage dealt. This difference may demonstrate that Xerath does not support by providing protection for him to deal more damage or that his allyship also helps increase the match's duration. Similarly, when Kassadin is played alongside Xerath on the same team, he usually scores many fewer killing sprees than when he plays on his own. This is contrasting evidence that he is worse when playing with Xerath.
Moreover, when Kassadin plays with Xerath on the same side, he often takes a little more damage than when he plays alone. Taking more damage could indicate that Xerath does a poor job of protecting Kassadin in teamfights.
There is no universally accepted best champion pairing for Kassadin that will no matter what be his #1 ally. Yet, overall, Xerath is a very typical companion for Kassadin. By playing on the same team as Kassadin, he increases their win rate by 0.5% to 50.5%. This signals that there is not really a strong bond between Kassadin and Xerath that allows them to perform at the top of their game together than alone.
Xerath has a lower difficulty than Kassadin. That means you don't need to be cautious when enlisting Xerath allies to play with, as they will require a lower level of skill to be able to do well with you.
Fighting on the same side, Kassadin players should expect to see an overall large increase in your team’s ability to deal magical damage. Combined, these champs can deal quite a lot of AP type damage.
Conversely, by aligning Kassadin and Xerath together, you will not be giving your team much AD. We recommend you include other champions on your team that nullifies this relative hole in their abilities.
Regardless of your Xerath ally's ability, you should focus on increasing your gold income, outlasting your enemies, and clearing objectives. If you heed this simple advice, you should do well anyway.
If you would like to truly master Kassadin in order to synergize with Xerath during both the early game and mid / late game phases of League, you should continue reading to master a few extra lessons on this champion pairing. If you listen to the build and tips displayed here, you should increase your win rate by a lot.
The top items to have in your Kassadin and Xerath synergy build consist of Seraph's Embrace, Stormsurge, and Rod of Ages. When Kassadin incorporated at least these three pieces in his build, he performed a lot better when fighting alongside Xerath than with many other typical builds. In fact, Kassadin had an average win rate of 50.5% when playing alongside Xerath with these items in his kit.
To have the greatest chance of defeating your oponents, you should use 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 combinations players picked for this champion pairing, this set of runes yielded the highest win rate. Notably, these runes averaged a 50.5% winrate overall.
By default, tips, statistics, and builds on how to team up Xerath with Kassadin are presented for all skill levels, merged. To scope the stats and builds to an individual skill level, you may use the selection menu above.