Try and keep targets in the range of your Flamespitter. It can deal a lot of damage overtime.
If you are winning a fight you can use your ultimate to wall off an escape path.
Try and pace yourself to stay in the Danger Zone to maximize your effectiveness. It is easy to overheat if you rapidly use your abilities.
Try to knock enemies back into your towers with Explosive Cask.
Try to combo Body Slam with Explosive Cask to set up kills for your team.
The damage reduction from Drunken Rage is applied when you start drinking, try to use it when you see damage coming your way.
The Rumble Gragas synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Gragas, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Rumble sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Gragas. His KDA worsened from NaN to NaN. This fall shows that Gragas helps Rumble perform not as well in competitive League games. Yet, the small difference demonstrates that this performance change is only marginal.
When Rumble plays on the same team as Gragas, he sees a little increase in his complete damage dealt. This could indicate that Gragas supports by providing cover for him to deal more damage or that his participation also helps increase the round's duration. Similarly, when Rumble is played alongside Gragas on the same team, he usually scores many fewer killing sprees than when he plays alone. This is contrasting evidence that he is worse when playing with Gragas.
Additionally, when Rumble plays with Gragas on the same side, he often receives a little more damage than when he fights alone. Receiving more damage could indicate that Gragas does a poor job of protecting Rumble during teamfights.
There is no ideal synergy for Rumble that will no matter what be his ideal teammate. However, Gragas is a terrible companion for Rumble. By being on the same side as Rumble, he drops their win rate by -3.8% to 45.5%. This shows that there is a terrible synergy between Rumble and Gragas that allows them to perform not as well together than without each other.
Gragas has a much lower diffuclty than Rumble. That means Rumble players don't need to be very careful when enlisting Gragas allies to play with, as they will have to have a much lower level of skill to be able to cooperate well with you.
Fighting alongside, you will likely see an overall large increase in your team’s ability to deal magical damage. Combined, these champs can deal quite a lot of AP type damage.
Conversely, by aligning Rumble and Gragas together, you will not be giving your other teammates a lot of attack damage. Plan to pick other champions on your team that neutralizes this hole in this pairing's potential.
Regardless of your Gragas ally's skill level, you need to focus on increasing your gold income, outlasting your enemies, and taking down objectives. If you do this, you should do well anyway.
To truly master Rumble in order to synergize with Gragas during both the laning and mid / late game phases of LoL, you should continue reading to pick up a few extra tips and tricks for this champion pairing. If you listen to the build and suggestions displayed above, you will increase your win rate by a lot.
The best finished items to use in your Rumble and Gragas synergy build consist of Hextech Rocketbelt, Zhonya's Hourglass, and Liandry's Torment. When Rumble incorporated at least these three items in his build, he performed much better when paired up with Gragas than with many other typical item sets. In fact, Rumble boasted an average winrate of 45.5% helping carry Gragas with this build.
To have the highest likelihood of defeating your oponents, you should equip the Arcane Comet, Nimbus Cloak, Absolute Focus, Scorch, Bone Plating, and Unflinching runes from the Sorcery and Resolve rune sets. Out of all the rune combinations players chose for this champion pairing, this blending of runes resulted in the top win rate. Moreover, these runes averaged a 45.5% win rate overall.
By default, tips, statistics, and builds on how to synergize Gragas with Rumble are displayed for all skill levels combined. If you want to scope the statistics and builds to a specific skill level, you may use the selection menu earlier in the counter matchup guide.