The first two blueprints, [Attack Arrow Tower] and [Thorny Wall], could both enhance the defense of the sanctuary. Especially the arrow tower, being an active attack device, would attack any intruders that came within range of the sanctuary.
Of course, just these two blueprints alone weren't enough to make Irving feel as if he had hit the jackpot.
[Mind Alarm Device]
This was the real highlight! The second round of cataclysm would simulate the environmental changes of the Dark Dominator devouring Bluestar. Besides the threat of extreme cold weather, there would be endless darkness... In a pitch-black environment where one couldn't see their hand in front of their face, there was a constant risk of being ambushed by alien beasts, leading to many deaths.
