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.
When Rek'Sai is near, she can see the position of you and your allies, but only if you're moving.
If you see one of Rek'Sai's tunnels, briefly stand on one of the entrances to destroy it.
Rek'Sai's Furious Bite gains damage as she builds Fury. Be very careful around her when her Fury is full.
The stat comparisons shown on this page feature some influential Amumu vs. Rek'Sai matchup statistics that can help us figure out the distinctions between the pair. As an example, Amumu’s KDA ratio ([kills + assists] / deaths) of NaN is more than Rek'Sai’s ratio of NaN, demonstrating that Amumu may be more central to his team's team fighting effectiveness than Rek'Sai..
Amumu often has a significantly smaller longest killing spree than his foe does. Commonly, he receives less damage than Rek'Sai. This typically indicates different amounts of tankyness, but it can also imply that the one champ has less agility and thus is not able to kite away from further harm when poked or engaged.
Both League of Legends champs are great. Both have their strengths, weaknesses, and counters. In League's current meta, Amumu usually loses when playing against Rek'Sai, with a 48.1% win rate. Therefore, Amumu makes a bad counter for Rek'Sai.
While Amumu does have a lower win rate compared to Rek'Sai, when facing one another, Amumu also has a greater level of difficulty that makes him a more difficult champ to develop with. You should be careful when picking Amumu into Rek'Sai.
Furthermore, Amumu also has a very large amount of CC and other utility, a similar amount to Rek'Sai. This often 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 Amumu vs Rek'Sai matchups, Rek'Sai is the better champ with a lower win rate, similar champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Amumu is a somewhat poor counter to Rek'Sai. Focus your play on keeping up your gold income and clearing objectives. If you can do that, you should hold your own as Amumu against Rek'Sai.
If you would like to truly master Amumu in order to counter Rek'Sai during both the laning and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you mind the build and suggestions presented above, you will increase your win rate significantly and be closer to League of Legends pro players.
Amumu often picks up a similar amount of CS compared to Rek'Sai. Champions who on average don't take many minion kills typically don't have to have much CS to be valuable teammates, such as supports. They are capable of scaling well off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually have to have a lot of items to be effective. In either case, try to do better than the numbers shown here to do well.
The best items to have in your Amumu versus Rek'Sai build consist of Sunfire Aegis, Thornmail, and Jak'Sho, The Protean. When Amumu used at least these three items in his build, he performed a lot better versus Rek'Sai than with many other typical item sets. In fact, Amumu had an average win rate of 48.1% when playing against Rek'Sai with this counter build.
To have the greatest likelihood of beating Rek'Sai as Amumu, Amumu players should take the Conqueror, Triumph, Legend: Tenacity, Last Stand, Cheap Shot, and Ultimate Hunter runes from the Precision and Domination rune sets. Out of all the rune builds players chose for Amumu vs Rek'Sai fights, this combination of runes resulted in the best win rate. Notably, these runes averaged a 48.1% winrate overall.
By default, tips, stats, and builds on how to beat Rek'Sai as Amumu are presented for all skill levels combined. To filter the statistics and builds to a particular player tier, you can use the selection menu earlier in the counter matchup guide.