In the lore and according to the myth Mothman is either meant to appear just before a catastrophe is about to occur or warn others of danger, I found it interesting that after launching a nuke from a silo I found a Mothman just ominously watching me at night far away from a cliff.
Whether this is a set event that has a chance to happen when you launch a nuke or just a big coincidence I don't know but either way it was one of the most unique and memorable events I've had in this game.
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