Gabriela Mercer 
The Lantern Makers [EPUB ebook] 
A City of Eternal Shadows

Beneath the City of Umbrakell, where the sun is a forgotten myth and bioluminescent flora paints the world in shades of emerald and sapphire, lies a secret yearning for the surface.  Elara Thorne, a gifted Lantern Maker, feels this yearning more acutely than most.  Her lanterns bloom with unprecedented radiance, and Glimmer, a sentient lantern of her creation, whispers tales of a lost world bathed in the mythical ‘sunlight.’
Driven by an ancient map, Elara ascends from the depths, accompanied by Rhys Alistair, a pragmatic scavenger whose cynicism is no match for the allure of forgotten treasures.  Their unlikely partnership, guided by the ever-present Glimmer, plunges them into a breathtaking ecosystem of glowing fungal forests, phosphorescent rivers, and creatures shaped by eternal darkness. Each step unveils a piece of Umbrakell’s hidden history, a history far more sinister than they could have imagined.
Their quest for light becomes a fight for survival as they uncover the chilling truth: the lanterns, symbols of Umbrakell’s beauty, are tools of control wielded by Nova Corp, the corporation that ravaged the surface and drove their ancestors underground. Elara’s unique gift–an ability to commune with the city’s living light–becomes a weapon against Nova Corp’s encroaching shadows. Rhys, the treasure hunter, transforms into a protector, his pragmatism giving way to a fierce belief in Elara’s vision.  Glimmer’s radiant glow, a beacon of hope, intensifies against the encroaching darkness.
Allied with the Whisperers, a reclusive group who communicate through bioluminescent skin patterns, Elara discovers the fungal forests are not merely flora, but a sentient network, a silent observer of Umbrakell’s history, suppressed by Nova Corp’s technology.  She learns to communicate with this network, awakening a dormant power that could shatter the city’s fragile stability.
As Elara’s quest ignites whispers of rebellion in Umbrakell, Nova Corp tightens its grip, and the city teeters on the brink of revolution. Their journey culminates in a perilous confrontation at the surface, a toxic wasteland beneath a dying sun, where Elara faces her estranged father, a high-ranking Nova Corp scientist, and the devastating truth about the lanterns’ control.