Just do it

"Anyway, let's finish this armor as soon as possible. I need to leave tomorrow, remember?" Brian changed their attention toward the armor and they continued their work.

Basically, the armor was almost complete. Now, they just need to create the Weapon Spirit. But first, they need to bring the armor online and make it fully functional. 

Only then, they can extract the life energy and soul energy from the pills to create the Weapon Spirit. Basically, Weapon Spirit is a manifestation of emotions through spiritual consciousness.

This spiritual consciousness or sea of consciousness has already been replaced with a microprocessor. And, now, they just had to install the 'OS' into this microprocessor. OS being the WS (Weapon Spirit).

(Note- OS is Operating System but here, I referenced it for Weapon spirit)