So, i spend a few hours a day wandering around the event zone and I noticed that with my balanced party (Earth, wind, fire) I don't kill nearly fast enough, all the enemies i'm facing are basically 3 star or less. (Apart from the bosses of course) Two of my pets are max stat, the third is mid stat, I just wanted some ideas for the best super fast chump killing party?

I was thinking maybe Wind, fire, fire? Or all fire?

I usualy do water, wind and fire with my fire pet being max stat and usualy it work preaty well to defeat bosses quickly. And defeat normal ennemy in one to three ( if one of them miss) turn

wind's 1 attack (the attack when you press 1, idk lol) has more DPS on a single enemy (110% dmg I think?), while fire's attacks 3 different enemies (idk if its at 100% per enemy or what)
so i think you're on the right track that its using wind or fire
other trees mainly help with survivability (water's something something absorbs damage, dark and light heal), but if you don't really care about survivability (like if your pets aren't dying, and you want to focus more on killing things), then you can focus on wind and fire

it depends on what you want, if you want to focus more on damaging 1 enemy or damaging multiple
a hybrid of fire and wind is good if you want to kill multiple but also focus a little bit of damage at one enemy, or just have an all-fire or all-wind if you wanna just cleanly kill at a constant rate.

as long as you have good equipment (epic, legendary or mythical equipment) that boost damages (strength and intelligence), it shouldn't make much of a difference, I feel like they all do the job if you get your strength or intelligence as high as possible. c: