Command: Protect can be used on yourself to return the Ball back to you quickly. Combine this with Command: Attack for a quick harassment.
Command: Dissonance is a very powerful escape tool if Orianna has the Ball. The combination of speed and leaving a slowing obstacle can be quite powerful.
Command: Shockwave can be used to drag enemies towards you or away from you if you position the Ball properly.
Amumu's Despair makes purchasing primarily Health items a risky proposition.
Erratic movement, or hiding behind creep waves can make it difficult for Amumu to instigate a fight with Bandage Toss.
Avoid bunching up with other allies when Amumu has his ultimate available.
The stats shown on this page clarify some vital Orianna against Amumu matchup stats that may help you understand the distinctions between the pair. As an example, Orianna’s KDA ratio ([kills + assists] / deaths) of NaN is more than Amumu’s KDA ratio of NaN, indicating that Orianna may be more central to her team's team fighting capability than Amumu..
Orianna normally has a similar longest kill spree as her foe does. Typically, she receives less damage than Amumu. This typically indicates differing health capacities, but it can also illustrate that the one champion has less agility and thus is unable to kite away from additional damage when poked or engaged.
Both LoL champions are great champions. Both have their pros and cons. In the game's current meta, Orianna usually fairs equally well when trying to fight Amumu, with a 50.2% win rate. Therefore, Orianna makes an ok counter for Amumu.
While Orianna does have a higher winrate compared to Amumu, when facing one another, Orianna also has a much greater level of difficulty that makes her a more complex champ to pick up and master. You still need to be cautious when picking Orianna into Amumuas her relative depth means you may not be able to unleash her full potential without a lot of practice beforehand.
Moreover, Orianna has some amount of utility and CC, a similar amount to Amumu. This makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there isn't a single best champion overall in League of Legends, in Orianna vs Amumu matchups, Orianna is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your allies during team fights.
Orianna is a decent counter for Amumu. You will do well by focussing your actions on increasing your CS and taking out objectives. If you can do that, you should be able to stand on your own as Orianna against Amumu.
If you would like to truly master Orianna to counter Amumu during both the laning and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you mind the build and stats displayed above, you should increase your win rate significantly and be closer to League of Legends pro players.
Orianna usually racks up much more CS compared to Amumu. Champs who on average don't acquire many minion kills typically don't have to have much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have many items to be effective. In either case, try to surpass the numbers shown here to do well.
The most crucial items to focus on in your Orianna versus Amumu build consist of Rabadon's Deathcap, Stormsurge, and Luden's Companion. When Orianna bought at least these three items in her build, she performed a lot better countering Amumu than with most other common builds. In fact, Orianna had an average winrate of 50.2% when countering Amumu with this counter build.
To have the greatest probability of beating Amumu as Orianna, Orianna players should equip the Summon Aery, Manaflow Band, Transcendence, Scorch, Biscuit Delivery, and Cosmic Insight runes from the Sorcery and Inspiration rune sets. Of all the runes players picked for Orianna vs Amumu matchups, this composite of runes resulted in the highest win rate. Notably, these runes provided a 50.2% win rate overall.
If you want to see Orianna vs Amumu tips and matchup stats and build suggestions for a a particular skill level, feel free to select one from the selection menu provided above. At first, the statistics and guides displayed are calculated using all games with data with both champs.