I’m a Skeleton of the Underworld, and I Sign In to Become an Undead Calamity

Gu Bin transmigrates to a world of swords and magic and is reborn as a tiny skeleton soldier in the Underworld.

Just as he is on the verge of despair, he discovers that he has been bound to a sign-in System.

Sign in at Dragonbone Mountain Range and receive the Nether Dragonbone Demon Sword.

Sign in at the Hellblood Pool and receive the Overlord's Egg.

Sign in at the Yier Underground Palace and receive the Soul Kingdom.

Sign in at the Pluto's Castle and receive the Immortal Throne.

When the realms of gods and demons wage war and try to swallow the Underworld, they discover that it has already been unified,

and that the one seated upon the throne is an absurdly powerful skeleton.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.