Li Chen had already witnessed the power of the Alien Civilization's Star Destroyer Motherships that Noah had shown him.
Judging by the footage he had seen back then, even a Level 1.5 Universe Civilization—
—after all its defensive forces had been destroyed, had no way to contend with those Star Destroyer Motherships.
That showed just how terrifying their firepower was.
Li Chen did not believe that the current Star-Level Shelter could withstand such attacks.
But on present-day Earth, aside from the Star-Level Shelter,
there was probably nowhere else that could be considered safer.
Except for the Space Shelter belonging to the Shadow Organization in outer space.
Since the possibility of escaping outside to avoid the disaster was nearly zero,
what Li Chen could do was improve the Star-Level Shelter's resistance to damage as much as possible.
Only then
could he ensure that,
when unforeseen accidents occurred,
when those aliens truly broke through the Shadow Organization's defenses and launched a full-scale invasion of Earth,
Earth Human would still have a relatively safe place to take shelter.
In other words, the Star-Level Shelter was humanity's final line of defense.
With that thought, Li Chen directly opened the synthesis and conversion panel.
A familiar interface resembling a Medicine Refining Cauldron appeared before him.
He directly searched for the synthesis interface for the Star-Level Shelter Upgrade Blueprint.
An Lv1 upgrade blueprint could only strengthen a Star-Level Shelter to a maximum of five stars.
Anything beyond that required higher-level upgrade blueprints.
Namely, an Lv2 Star-Level Shelter Upgrade Blueprint.
Synthesizing one required five Lv1 blueprints.
A single Lv1 blueprint required 100 million Evolution Energy and 10 million First Generation Level 8 Energy Crystal Cores.
For the Li Chen of the past, that would have been an enormous figure.
But now, that little expense was nothing.
Without