The Shelter Was so Frightened That It Upgraded Itself!

A huge countdown appears in the sky, and there are only fifteen days left for mankind! Chen Feng traveled to this world and created his own sanctuary before the countdown ended. When the first wave hit, the shivering shelter decided to upgrade itself! Your shelter is so scared that it decides to upgrade itself to deal with the coming danger! Your shelter has successfully upgraded its fire system! Your shelter has been successfully upgraded to the mutation laboratory! Your shelter has been successfully upgraded to a mobile giant fortress! Your shelter has successfully upgraded the void jump module! Your shelter has successfully upgraded the dimensionality reduction strike series weapons... Chen Feng: "???" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.