Despair is very effective against other tanks, so make sure you're in range of opponents with the highest Health.
Amumu is highly dependent on teammates, so try laning with your friends for maximum effectiveness.
Cooldown Reduction on Amumu is very strong, but it's often difficult to itemize for it. Grab the Golem buff whenever possible to gain Cooldown Reduction without sacrificing stats.
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 shown here emphasize several strategic Amumu against Sion counter statistics that can help you explain the distinctions between this pair of champions. For instance, Amumu’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sion’s ratio of NaN, showing that Amumu may be more central to his team's team fighting capability than Sion. This observation is largely caused by the differences in assists.
Amumu often has a similar longest killing spree as his counter does. Commonly, he takes less damage than Sion. This is usually reflective of differing health capacities, but it can also imply that the one champ has less mobility and thus is unable to flee from further damage when poked or engaged.
Both LoL champions are great. Both champs have their pros and cons. In League's current meta, Amumu usually loses when trying to fight Sion, with a 47.7% win rate. Therefore, Amumu makes a bad counter to Sion.
While Amumu does have a lower win rate than Sion, when on opposite teams, Amumu also has a lower level of difficulty that makes him a less challenging character to learn and master. You may get destroyed when picking Amumu into Sion.
Additionally, Amumu also has a very large amount of CC and other utility, a similar amount to Sion. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there isn't one best champion in League of Legends, in Amumu vs Sion matchups, Sion is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Amumu is a terribly counter for Sion. Focus your tactics on increasing your CS and taking out objectives. If you are able to do that, you should hold your own as Amumu against Sion.
To truly master Amumu to counter Sion during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this matchup. If you listen to the build and tips shown here, you will grow your win rate by a lot and be closer to League of Legends pro players.
Amumu most often accumulates a lot less CS relative to Sion. Champs who typically don't earn much CS often don't have to have much CS to be valuable teammates, such as support champions. They are able to scale well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually require several high cost items to be effective. In either situation, try to exceed the values reported here to do well.
The ideal items to have in your Amumu versus Sion build consist of Sunfire Aegis, Thornmail, and Randuin's Omen. When Amumu bought at least these three pieces in his build, he did much better vs. Sion than with most other commonly used item sets. In fact, Amumu had an average win rate of 47.7% battling Sion with this counter build.
To have the greatest probability of annihilating Sion as Amumu, you should take the Conqueror, Triumph, Legend: Tenacity, Last Stand, Cheap Shot, and Ultimate Hunter runes from the Precision and Domination rune sets. Of all the rune combinations players chose for Amumu vs Sion LoL games, this combo of runes resulted in the best win rate. Notably, these runes gave a 47.7% win rate overall.
By default, tips, stats, and builds on how to beat Sion as Amumu are shown for all ranked divisions combined. If you want to narrow the statistics and builds to a particular skill level, you may use the selection menu at the top of this page.