Work for Carrie Summers and her Stonehaven League series!! this is book number 7!
She further continues the adventure of Devon Walker, a girl hired to test out a new video game. The book is her adventure within the game, so reading it feels like playing an MMORPG (thus, this is a litRPG genre). Carrie requested "a huge, blue, ethereal serpent sapping Devon's mana, reducing her damage". When I think of ethereal, I always think of the ghosts in Ghostbusters, where the shadow area is see-through. I like to use different palettes for each book so they all look different.
Check out the book here: https://www.amazon.com/gp/product/B082RH3RP7/ref=dbs_a_def_rwt_bibl_vppi_i1
Previous books:
https://www.artstation.com/artwork/dOdrKK
https://www.artstation.com/artwork/A96EJe
https://www.artstation.com/artwork/EV9an8