Image imported from derpibooru 
Original Description:
 
“Nightmare Flaring Earth” - this is Firefly Solstice’s corrupt/evil side. this Firefly Solstice’s nightmare form when she is consumed by darkness or when she gives in to her nightmares. this side doesn’t come up too often.
 
She has a fiery mane and tail,fire-y armor,and a fire symbol on the armor
 
She has fire and earth powers/can control fire,vines etc.
 
Has red magic when using fire powers  
Has green magic when using earth powers