for people who haven't played fractals of the mists in guild wars 2:
bouncing viirastra's marble is a required mechanic; if you drop it it explodes and turns into an angry air elemental
skorvald's eye icon, like pretty much every boss with this mechanic, means "physically turn your character to look away or you will take damage and get stunned or worse"
standing on the pressure plates in the underground fractal is required to progress
mai trin is immune to damage unless she stands in horrik's purple attack
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