The Temporal Vortex challenge gets harder as you progress, going from Difficulty 1 all the way to Difficulty 4. After Difficulty 4, different effects will start rotating. To keep your ranking high at Difficulty 4, you'll need to tweak your team based on each special effect.
Below are some team recommendations for the early-game Temporal Vortex.
In the early-game Temporal Vortex, boss attack damage is pretty low. You can bring 4 heroes from the same faction to really push up your damage output and hit higher damage ceilings. For healing, feel free to bring heroes from any element.
 

Wild

 

  

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Poison

 

 

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Dauntless

 
 

 

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Rally

 
 

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Summon

 

 

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Frost

 

 

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