Sumeru will introduce the Dendro element for the first time when Version 3.0 drops and according to leaks Dendro will be an element like no other. Since Dendro will allow triple reactions and the element is not easily removed, players will have to optimize their rotations and this is not easily done.
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It’s already been confirmed that Dendro will only react with Pyro, Hydro, and Electro. According to leaks, Dendro is also not easily removed once applied. And even though Dendro does not react with Anemo, Cryo or Geo, the elements Dendro does react with- Pyro, Hydro, and Electro do react with Cryo and Anemo. Since Dendro retains the elemental status of itself and another element once applied, chances are we can still trigger Swirls and Cryo-based elemental reactions while enemies are still affected by Dendro and Pyro, Hydro, or Electro.
Players will have to experience the Dendro element for themselves and see how it functions in combat and depending on that choose their party compositions and character rotations. Since Sumeru will also have enemies that will drop specific materials depending on what elemental reaction killed them, players will also have to diversify and improvise from their usual playstyle to deal with these mobs efficiently.
While we can assume most Dendro-centric teams will compose of Pyro, Hydro, and Electro characters, we cannot yet be sure if Dendro and Sumeru will make the other 3 elements namely- Anemo, Geo, and Cryo drop in value and usefulness. Leaks confirm that while Dendro cannot be swirled, elements in reaction to it can be and enemies will also be affected by Anemo’s crowd control utility.
Players will have to seriously consider their team comps and rotations to efficiently deal with Sumerian monsters and quests and thus players will need to hone not only their combat skills but also their character builds and versatility.