Roar of the Slayer is a great setup ability to land a very powerful Decimating Smash.
The Soul Furnace buff displays how much shield strength is remaining, use this information to time its explosion perfectly.
You only have very slight turning ability during Unstoppable Onslaught, so make sure to use it in straight paths.
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.
The Sion Kassadin synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Kassadin, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Sion sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Kassadin. His KDA worsened from NaN to NaN. This worsening shows that Kassadin helps Sion perform worse in ranked League rounds. Yet, the small difference proves that this performance change is not very impactful.
When Sion is paired with Kassadin, he observes a barely noticable drop in his complete damage output. This difference may signal that Kassadin doesn't help cover for him to dish out more damage or that his presence also helps increase the game's duration. Similarly, when Sion is played together with Kassadin on the same team, he usually scores many fewer killing sprees compared to when he plays without Kassadin. This is contrasting evidence that he is worse when playing alongside Kassadin.
Moreover, when Sion plays with Kassadin on the same side, he usually receives a little less damage than when he plays alone. Getting dealt not as much damage may indicate that Kassadin does a decent job of covering Sion in teamfights.
There is no top champion pairing for Sion that will 100% of the time be his #1 teammate. However, Kassadin is a very typical teammate for Sion. By locking into the same side as Sion, he raises their win rate by 0.9% to 51.1%. This proves that there is not really a strong synergy between Sion and Kassadin that allows them to perform at the top of their game together than alone.
Kassadin has a greater difficulty than Sion. That means Sion players must be cautious when arranging Kassadin teammates to fight alongside, as they will need a greater level of skill to do well with you.
Working alongside, you will likely witness an overall large increase in your team’s ability to to cover for your other teammates. Combined, these two might be able to provide enough cover for their team's carries.
Conversely, by aligning Sion and Kassadin together, you may not be providing your team much attack damage. Plan to bring other champions on your team that fills this relative gap in their capabilities.
Regardless of your Kassadin ally's ability, you need to focus on increasing your income, staying alive by avoiding foolish fights, and taking down objectives. If you heed this simple advice, you will do well, regardless.
To truly master Sion in order to work well with Kassadin during both the early game and mid / late game phases of League, you should keep reading to learn some more lessons on this champion pairing. If you mind the build and tips shown here, you will increase your win rate by a lot.
The top items to focus on in your Sion and Kassadin synergy build consist of Sunfire Aegis, Heartsteel, and Titanic Hydra. When Sion combined at least these three items in his build, he performed a lot better as an ally of Kassadin than with many other common item sets. In fact, Sion had an average win rate of 51.1% when playing alongside Kassadin with this build.
To have the greatest chance of beating your oponents, you should equip the Grasp of the Undying, Demolish, Conditioning, Overgrowth, Minion Dematerializer, and Approach Velocity runes from the Resolve and Inspiration rune sets. Out of all the rune combinations that we analyzed for this champion pairing, this sequence of runes resulted in the highest win rate. Moreover, these runes gave a 51.1% winrate overall.
If you need to view Sion and Kassadin cooperations tips and stats for a a particular division, feel free to choose one from the selection menu displayed above. By default, the stats and build suggestions given are calculated using all games run with both champs.