I have the second core but i really dont have a use for it. It should be unlocked later when you need the space, or there should be more processes to put in it
At first I didnt like it because I thought the sacrifice angels investments were taken out, but I found them. Its a beautiful new interface but I feel like it doesn't make economical use of my screen. The Achievements notification blocks my donut number when I am buying more Dunk'n Donuts. The old UI showed more upgrades on the list, this one only shows 4. This update isnt too bad. Some of the flashy shapes huge text (were not blind) and wacky designs need to be toned down for a less awkward menu navigating experience.
It's a global 5% for each use. It's basically like a temporary trinket for that reset.