What to do?
FORUMI have these mats sitting in my inventory and I'm not sure how to best use them. Should I use them as is & 5☆ one of my 4☆ childs? Or should I evolve the 4☆ mats into 5s and then use them to make a 6☆ child I need?

Evo aurora heart 4* into 5* to help get your 5*s to 6, I do this because they're already set materials with no stats and skills like childs. Childs on the other hand at any rank can be useful. WARNING gold consumption and fire crystal consumption, make sure to farm lol
I combine to my fire child the end ヽ(✿→∀←)ノ lalala♫
I evolve mine to 5* for evolving my natural 5*s. I keep running low on fire stones tho
I spend all my rumble coins on fire stones in the arena. Have not tried reseting the fire event tho. Saving my crystals.
I go for the very slow process and collect them as I can. I never seem to have enough to buy them from the rumble shop but I do when I can. And I seldom reset the evolution dungeon. I'm not sure if I have 20 4☆ childs to fodder off to upgrade the mats. But I'm sure I have at least 8. Ty MAS
My suggestions:
Reset Tuesday and Sunday’s fire evolve materials once (300crystals), evolve 4 star slime to 5 star.
Use 3 stars slime as evolve fodders to evolve your own max lvl 3 star child, and be sure to pick the element that you have spare materials.
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