The Depths Worm is a hostile creature found in Caves and Ruins. When it is not engaged with the player, it will seek out areas with harvestable objects then set its lure and lay in wait, or emerge to consume meats. If the player approaches the displayed lure, the worm will emerge and attack. During this time the main body of the worm resides underground.

The Depths Worm serves the same function below ground as Hounds above ground; they will periodically spawn in a wave to attack the player. Before an attack, the player will begin to hear rumbling growls which grow more frequent the closer the attack draws. The older a world is, the more frequently attacks will come and the more worms will spawn with each wave. Initially attacks will occur every 10 days with 2 worms. At 150 days the waves reach their maximum intensity and will come every 3 days with 6 worms.

With normal damage modifier characters, depending on size, they take 27 hits with a Spear, 22 with a Bat Bat, 18 with a Tentacle Spike, 16 with a Ham Bat and Thulecite Club, and 14 with Dark Sword to be killed. Depths Worms cannot be frozen by an Ice Staff but being hit by it will still stun them.

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While underground, Depth Worms will rarely trigger Tooth Traps, making them a poor defensive option when facing multiple Worms. Bee Mines on the other hand will do wonders. Five or six of them will be enough to deal with a worm.

Pigs and Bunnymen will ensure a safe place from the worms as the pigs and bunnies will attack them on sight. The bigger the waves are the more houses and hutches you will need though. Giving protective helmets to them will make them more efficient.

Rock Lobsters are the best option to deal with worms. A sizable herd will make quick work of worm waves even when they're at their maximum size. The lobsters don't need to be at their maximum size - small ones will work too.

If timed just right, a whack as the worm emerges from the ground will cause it to wince and retreat underground without attacking, though it will soon rise and try again. As long as the player keeps moving around, one can deal with 1-2 worms this way.

Depth Worms drop 4 Monster Meats apiece, meaning that a wave of 6 worms can leave you with 24. If you are lucky enough to find a pond in a cave, this vast quantity of Monster Meat can be used to cook 12 Fish Sticks for each wave.