A Tower so immense, a ship capable of traveling through time and space, a cult nest hiding countless secrets... How many doors will there be here?
Many, many.
Those connecting different floors, different rooms, different corridors, or merely used to cut off specific areas, acting as security barriers, each door now quietly awaits the fateful passerby.
A team cautiously advances through the connecting passageway leading to the core cabin in the D-1 zone, seeking traces of the intruder.
An outsider is hiding on this ship, attacking the previous first combat team and retrieval group and invading parts of the ship's systems. Now, the surveillance system is no longer reliable, and the intruders can only be found through manpower.