Chitin

Six legs. Compound eyes. A body built to consume or be consumed.
The spire is alive. The floor is dissolving. The only direction is up.

A creature hatches at the bottom of a living mega-structure with no memory, no language, and an instinct that sorts the world into two categories: prey and threat. The spire rises above it in layered biomes, each one gated by biological membranes that reshape whatever passes through. Below, the structure is digesting itself. Floors dissolve. Ecosystems vanish. The creature must evolve upward or be absorbed with everything it has ever known.

A monster evolution LitRPG with permanent choices, alien perception, and a collapsing world that never stops climbing behind you.

Every kill changes the body. Consume a rival and inherit its reflexes. Choose venom over armor and the armor path closes forever. Each biome demands specific adaptations to survive, and each evolution gate reshapes the creature for the world above while locking it out of the world below. The creature that hatches pale and soft in a fungal cavern will end the book near-black, six-legged, venom-tipped, carrying the integrated chemistry of three biomes in an exoskeleton built from everything it ate.

Something much larger has climbed this route before. Its trail is gouged into the walls at a scale the creature cannot yet comprehend. The spire produces climbers in its lowest chambers and dissolves the chambers behind them. Whether the dissolution is a threat or a design is a question the creature is not yet intelligent enough to ask.

You'll love this book if you enjoy:

• Genuine non-human POV where the creature thinks, perceives, and evolves as an alien organism
• Permanent evolution choices with visible consequences the reader can debate
• Progression fantasy with tangible tier advancement shown through body changes, not stat sheets
• A collapsing-structure timer that creates binge-read urgency from page one
• Dark fantasy with predatory intelligence, no humor-first tone, and no isekai human consciousness

The body carries what it consumed. The floor carries what it left behind.