Tremors cause frequent earthquakes that disrupt the battlefield by stunning both Helldivers and enemies. When a tremor begins, it instantly drains all stamina and stuns creatures for the entire duration, making them vulnerable. However, for Helldivers, the effect only slows movement rather than fully immobilizing them. These tremors do not affect the entire map but instead occur in a large area around a randomly selected player, adding an unpredictable element to combat.