Octopath Traveler 2: Shadow Fog Event
This is a very rare event that can happen in the overworld after you finish up chapter 1 of the game... all NPCS will disappear from that area of the map and after a short time you'll be attacked by a shadow monster.
I've only seen this twice in the game (not counting the scripted one in Osvald's story) one time during chapter 2 in the new delsta flats and another time right as I'm getting ready for endgame. I'm honestly not sure what the odds are of them happening but given I've only had it happen twice within 80 hours I imagine it's probably similar to a shiny pokemon.
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TitaRussell currently has 36,227 views spread across 49 videos for Octopath Traveler II. The game makes up over 1 day of published video on his channel, or 3.34% of the total watchable video for Octopath Traveler II on TitaRussell's YouTube channel.