Sid The Skeleton

Sid wakes deep beneath the surface of an unfamiliar world with no memory of how he got there—and no flesh left on his body. Then he discovers something impossible: he can resurrect the dead from the modern world as skeletons. Soon, Sid has assembled an unlikely group of resurrected strangers, each carrying knowledge from their former lives. Trapped in an enormous underground labyrinth filled with strange crystals, monstrous creatures, and mysteries that defy everything they know, surviving means rebuilding technology from the ground up. Armed with nothing but their old-world knowledge, questionable teamwork, and an alarming abundance of bones, they’ll have to build their way out. — Description from novelcodex.org