Gwen can still damage enemies outside her Hallowed Mists, especially with her Ultimate's range.
Some of Gwen's Abilities can apply her passive to multiple enemies, so aim them at groups to get maximum damage and healing.
Always be Attacking - In addition to dealing bonus damage, Gwen's Attacks empower or reset many of her Abilities.
Use the time after Sion has died to reposition and prepare for his return.
Even if Sion still hits a Decimating Smash, making him release the charge earlier reduces its impact.
The stats provided here show several valuable Gwen vs. Sion matchup statistics that may help you distinguish the differences and similarities between the pair. Gwen’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sion’s KDA ratio of NaN, highlighting that Gwen may be more central to her team's team fighting capacity than Sion. This observation is in large part caused by the difference in kills.
Gwen normally has a slightly larger longest kill spree than her foe does. On average, she receives less damage than Sion. This often reflects different amounts of tankyness, but it can also imply that the champion with more health has less mobility and thus is unable to kite away from further harm when engaged or poked.
Both League of Legends champions are great champions. Both champs have their pros and cons. In the game's current meta, Gwen usually wins when playing against Sion, with a 53.0% win rate. Thus, Gwen makes a good counter for Sion.
While Gwen does have a higher win rate than Sion, when on opposite teams, Gwen also has a greater level of difficulty that makes her a more time consuming character to develop with. You should be be fine when picking Gwen into Sion.
Furthermore, Gwen has some amount of utility and CC, a similar amount to Sion. This often makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there isn't a single best champion for every situation in League of Legends, in Gwen vs Sion matchups, Gwen is the better champion with a noticably higher win rate, similar champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Gwen is a good counter to Sion. Focus your actions on keeping up your gold and cs and clearing objectives. If you do that, you should hold your own as Gwen against Sion.
To learn all of the intricacies of Gwen in order to counter Sion during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra tips and tricks for this matchup. If you listen to the build and stats presented above, you will increase your win rate by a lot and be that much closer to League of Legends pro players.
Gwen most often picks up a similar amount of CS as Sion. Champs who typically don't acquire many minion kills often don't have to have much CS to be valuable teammates, such as supports. They are able to scale properly off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically require several high cost items to be effective. In either situation, try to do better than the values reported on this page to do well.
The best items to prioritize in your Gwen versus Sion build include Riftmaker, Rabadon's Deathcap, and Nashor's Tooth. When Gwen used at least these three pieces in her build, she performed much better when fighting Sion than with most other common counter builds. In fact, Gwen had an average winrate of 53.0% when countering Sion with this counter build.
To have the highest likelihood of coming out on top against Sion as Gwen, you should take the Conqueror, Presence of Mind, Legend: Alacrity, Last Stand, Biscuit Delivery, and Magical Footwear runes from the Precision and Inspiration rune sets. Out of all the rune builds that we analyzed for Gwen vs Sion face-offs, this blending of runes resulted in the best win rate. In fact, these runes provided a 53.0% winrate overall.
If you want to see Gwen x Sion tips and counter stats for a a particular division rank, feel free to choose one from the selection menu displayed above. If viewing for the first time, the statistics and strategies displayed are computed using all games run with these champs.