[Thank goodness, otherwise Tsukikage would have to explain and apologise for detonating about nine litres worth of ammonia explosives on him/the blob.]

It's true. With the enhanced abilities and magic, it'll be difficult to do anything about monsters. Shades in particular may be wily because of their ability to shapeshift. But there are a few things we can do to secure the place, even without holy magic.

Just note that whatever we do is not going to stop someone from just smashing through the wall or the window. If a minotaur or troll decides to break in, they'll go in hard and loud. But by the time we're done, nothing and no one should be able to sneak in.