Diablo 4 players of all skill levels live in fear of The Butcher, a super unique boss that has an infinitesimal chance of spawning every single time you enter a cellar or dungeon and making mincemeat out of you. The community has lived in fear ever since, but GoinPostle2 posted a video to YouTube that could very well save your life and is worth watching.
Essentially, it comes down to paying attention to musical cues. When entering a new area, if you hear the particular sound isolated in the above video, it means you're in imminent danger. The law of averages demands a price be paid for all that shiny, shiny loot, and The Butcher is here to collect. New players are obviously going to have a bad time, but veterans fear The Butcher as well, as they are more likely to be playing Hardcore characters, where one mistake means total character annihilation.