My Shelter Levels Up Without Limit, What in the World Is a Cosmic Fortress?

The red moon appeared, and zombies, demon beasts, and devils surged forth like a tidal wave.

Zhang Heng obtained a shelter that could be upgraded without limit.

[Spend 1,288 Kill Points to upgrade the shelter to the Doomsday Lava Fortress]

The crimson fortress was indestructible.

Red-hot lava burst forth, effortlessly melting the zombie horde away.

Zhang Heng lounged on the top floor of the Lava Fortress, sipping wine as he watched.

[Spend 2,556 Kill Points to install an anti-gravity annihilation cannon]

Dark matter poured from the cannon's muzzle, streaking across the sky.

The Demon Lord plummeted helplessly from above.

[Spend 12,533 Kill Points to install the Falling Star Defense Formation]

[Spend 2,778,901 Kill Points to upgrade the shelter to the Primordial Cosmic Phenomena Sanctuary]