Try to stay away from walls. Ornn is much less strong if he cannot stun you.
Attack Ornn to keep him from creating items in lane.
The stats shown on this page emphasize some critical Senna against Ornn counter statistics that can help you understand the differences and similarities between the pair. For instance, Senna’s KDA ratio ([kills + assists] / deaths) of NaN is better than Ornn’s KDA ratio of NaN, indicating that Senna may be more central to her team's team fighting potential than Ornn..
Senna typically has a similar longest killing spree as her counter does. Commonly, she receives less damage than Ornn. This is usually reflective of differing health capacities, but it can also illustrate that the champion with higher health has less agility and thus is unable to flee from additional harm when engaged or poked.
Both LoL champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Senna usually fairs equally well when playing against Ornn, with a 50.6% win rate. Thus, Senna makes an ok counter for Ornn.
While Senna does have a higher winrate than Ornn, when they face off with one another, Senna also has a greater level of difficulty that makes her a more complex champ to learn and master. You should be careful when picking Senna into Ornnas her relative depth means you may not be able to reach her full potential without a significant amount of practice beforehand.
Additionally, Senna also has a good amount of utility and CC, a similar amount to Ornn. This makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Senna vs Ornn matchups, Senna is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your allies during late stage team fights.
Senna is a decent counter for Ornn. Make sure you focus your tactics on increasing your gold income and destroying objectives. If you can do that, you should be able to stand on your own as Senna against Ornn.
To truly master Senna to counter Ornn during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you listen to the build and stats presented above, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Senna typically accumulates less CS relative to Ornn. Champions who on average don't acquire many minion kills usualy don't need much CS to be effective, such as sup champs. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically have to have a lot of items to be effective. In either case, try to surpass the values reported here to do well.
The most crucial items to focus on in your Senna versus Ornn build include Youmuu's Ghostblade, Edge of Night, and Bloodsong. When Senna incorporated at least these three items in her build, she did much better vs Ornn than with most other typical item sets. In fact, Senna boasted an average winrate of 50.6% battling Ornn with this counter build.
To have the highest chance of beating Ornn as Senna, you should use the Fleet Footwork, Presence of Mind, Legend: Alacrity, Cut Down, Bone Plating, and Revitalize runes from the Precision and Resolve rune sets. Out of all the rune sets players used for Senna vs Ornn LoL games, this combination of runes yielded the greatest win rate. In fact, these runes averaged a 50.6% winrate overall.
If you need to view Senna x Ornn tips and counter builds for a a distinct division, feel free to select one from the selection menu shown above. If viewing for the first time, the statistics and strategies given are computed using every game finished with these champions.