Volcanic Rupture can be used to set up zoning areas to threaten enemies.
Learning build paths of items can help quickly select upgrades in lane.
The order of your abilties matters! Try to optimize Brittle usage.
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 stat comparisons provided here show several influential Ornn vs. Sion matchup stats that can help you appreciate the differences between the two. For instance, Ornn’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Sion’s ratio of NaN, showing that Ornn may be more central to his team's team fighting capability than Sion..
Ornn typically has a similar longest killing spree as his opponent does. Typically, he takes less damage than Sion. This often reflects different amounts of tankyness, but it can also indicate that the one champion has less mobility and thus is unable to escape additional damage when poked or engaged.
Both League champions are great. Both have their pros and cons. In League's current meta, Ornn usually wins when playing against Sion, with a 52.0% win rate. Thus, Ornn makes a good counter for Sion.
While Ornn does have a higher winrate compared to Sion, when on opposite teams, Ornn also has a greater difficulty level that makes him a more complex champion to pick up and master. You should be careful when picking Ornn into Sion.
Moreover, Ornn also has a good amount of CC and other utility, a similar amount to Sion. This makes her just as valuable during teamfights, especially when trying to counter champions with a lot of burst damage.
While there isn't a single best champion in League of Legends, in Ornn vs Sion matchups, Ornn is the better champ with a higher win rate, similar champion depth, and a similar amount of utility to help out your allied champions during teamfights.
Ornn is a decent counter to Sion. You will do well by focussing your tactics on increasing your gold income and destroying objectives. If you are able to do that, you should be able to stand on your own as Ornn against Sion.
If you would like to learn all of the intricacies of Ornn in order to counter Sion during both the laning and mid / late game phases of League of Legends, you should keep reading to gather a few extra lessons on this matchup. If you listen to the build and suggestions shown here, you will increase your win rate by a lot and be that much closer to League of Legends pro players.
Ornn on average gets a similar amount of CS compared to Sion. Champions who on average don't acquire much CS typically don't have to have much CS to be effective, such as support champions. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have several high cost items to be effective. In either situation, try to do better than the numbers displayed here to do well.
The ideal items to have in your Ornn versus Sion build include Sunfire Aegis, Thornmail, and Hope Adrift. When Ornn incorporated at least these three pieces in his build, he did a lot better when facing Sion than with most other common counter builds. In fact, Ornn had an average win rate of 52.0% battling Sion with this build.
To have the highest probability of annihilating Sion as Ornn, Ornn players should equip the Grasp of the Undying, Demolish, Conditioning, Overgrowth, Legend: Tenacity, and Triumph runes from the Resolve and Precision rune sets. Out of all the rune builds players picked for Ornn vs Sion counterpicks, this order of runes resulted in the best win rate. Notably, these runes provided a 52.0% winrate overall.
By default, tips, statistics, and builds on how to beat Sion as Ornn are shown for all skill levels, merged. If you would like to filter the stats and builds to a particular skill level, you can use the selection menu earlier in the counter matchup guide.