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.
Keeping tunnels spread out across the map will ensure you have choices when you want to cast Void Rush.
Cast Burrow before travelling around the map to take advantage of the increased Move Speed and the safety provided by Tremor Sense.
Tremor Sense can warn you of enemies closing in, and is particularly useful when entering enemy territory.
The Amumu Rek'Sai synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Rek'Sai, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Amumu sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Rek'Sai. His KDA worsened from NaN to NaN. This drop shows that Rek'Sai helps Amumu perform worse in ranked League of Legends matches. Yet, the small difference demonstrates that this performance change is only marginal.
When Amumu plays on the same team as Rek'Sai, he observes a big decrease in his full damage dealt. This may indicate that Rek'Sai does not provide protection for him to deal more damage or that his presence also helps increase the game's duration. Similarly, when Amumu is played alongside Rek'Sai on the same team, he usually scores many fewer killing sprees than when he plays without Rek'Sai. This is contrasting evidence that he is worse when playing alongside Rek'Sai.
Moreover, when Amumu plays with Rek'Sai on the same side, he usually takes much less damage than when he plays alone. Taking not as much damage could mean that Rek'Sai does a decent job of covering Amumu during teamfights.
There is no top synergy for Amumu that will 100% of the time be his ideal synergy. However, Rek'Sai is a fantastic ally for Amumu. By being on the same side as Amumu, he increases their win rate by 5.8% to 54.8%. This demonstrates that there is an important strategic relationship between Amumu and Rek'Sai that allows them to perform better together than alone.
Rek'Sai has a lower difficulty than Amumu. That means you don't need to be careful when enlisting Rek'Sai comrades to go into battle on the same side as, as they will need a lower level of skill to be able to play well with you.
Working on the same side, you will likely witness an overall large increase in your team’s capability to support your allies. When paired, these champions will help their other teammates secure a victory.
Conversely, by grouping Amumu and Rek'Sai together, you will not be providing your side enough anti-tank damage dealing potential. Make sure to pick other champions on your team that offsets this hole in this pairing's potential.
Regardless of your Rek'Sai ally's ability, you need to focus on increasing your gold income, warding to avoid ambushes, and taking down objectives. If you follow these simple suggestions, you will do well, regardless.
If you would like to truly master Amumu in order to synergize with Rek'Sai during both the laning and mid / late game phases of League of Legends games, you should continue reading to pick up additional tricks and insights into this champion pairing. If you pay attention to the build and stats presented above, you should increase your win rate by a lot.
The ideal items to have in your Amumu and Rek'Sai synergy build include Sunfire Aegis, Frozen Heart, and Abyssal Mask. When Amumu bought at least these three items in his build, he performed much better when fighting alongside Rek'Sai than with many other typical item sets. In fact, Amumu boasted an average winrate of 54.8% when playing alongside Rek'Sai with this build.
To have the highest likelihood of beating your oponents, Amumu players should equip the Aftershock, Font of Life, Bone Plating, Unflinching, Cheap Shot, and Ultimate Hunter runes from the Resolve and Domination rune sets. Of all the rune combinations players picked for this team composition, this order of runes yielded the best win rate. Moreover, these runes gave a 54.8% winrate overall.
If you would like to see Amumu with Rek'Sai cooperations tips and builds for a a specific skill level, feel free to choose one from the selection menu above. By default, the stats and guides shown are computed using every round with data with these champs.