Invincible Through Sign-Ins: I'm the Lord of a Doomsday Fortress City

Zhao Xian transmigrates to a world of magic and battle qi, and is immediately made a lord.

But his fief lies deep in enemy territory. Fortunately, Zhao Xian awakens a sign-in System just in time.

Sign in at the Glorious Battlefield: digitized vision;

Sign in at the Marquis's Castle: apocalypse fortress;

Sign in beside a black dragon's corpse: black dragon descendant bloodline.

Zhao Xian grows from a lord ruling a remote corner into the lord of an apocalypse fortress!

At last, the apocalypse arrives, and there is nowhere to run.

The haughty Dark Elf girl: "Sisters, let's join Zhao Xian. It's the safest place in the world!"

The cute, airheaded cat-eared girl: "Meow! So this is what the tech side is like? I've never seen such an impressive fortress!"

The holy and beautiful angel: "What incredible firepower! It seems only Zhao Xian can save the world!"

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