Nope. Just no. Lets just state the reasons shall we,
1. Its a weapon that is a huge gamble. Looking from every perspective possible, its a huge gamble. Removing magic doesnt mean you would solve problems. They could have guns or even canons. Unless they have a weapon to bring back magic, this would have gone terribly wrong.
2. Its creepy. Like i agree that it looks cool but the face itself is very creepy. I could literaly have nightmares bro. And the fact that its underground makes it so much creepier. Just imagine walkin down a street then a huge face appears from underground.
3. Numbers. It was said that there were 3000 faces. Like what? Why would you have so many faces. Its bad enough having 1 but 3000? Imagine if someone from another place gets control over it? Which in this case actually happened. The whole world almost met its doom.
Overall i am alright with it. But there are just too many cons with this idea.