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Brother Moncrief's note is a paper note in Fallout 76. It is written by Brother Moncrief.
It can be found on the top floor of Landview Lighthouse on a crate next to the skeleton of Brother Moncrief.
I was right. The Fireflies come here to mate. They go a little crazy, and I got hurt pretty bad, but I was able to gather enough goo to light the lamp.
Now I just have to wait. The Great Mothman will come. He has to.