Worm

The  is a mob that spawns when mining inside the Crystal Hollows.

Spawning
The Worm has a chance to spawn when the player breaks blocks within a tunnel 1 block wide, 2 blocks high and 5+ blocks long. When the appropriate conditions are met, the Worm will have a chance to spawn upon breaking the next block.

After digging out a 1 wide 2 high tunnel, breaking the blocks at the player's eye level on the side can still trigger Worm spawns. Breaking the blocks at foot level will not trigger spawns.

While spawning, they make a unique squelching sound 3 times, alerting players of their presence.

Behavior
They appear as a chain of heads with the same texture of the Scatha Pet. Every hit will remove 1 from their health, similarly to Spooky Festival mobs. They start off with a chain of 5 segments, and decrease by one each hit until killed.

Upon spawning, they will slither away from the player.

Trivia

 * When using the Mole perk, the player will not be able to spawn Worms because the tunnel dug will not be 1x2. However, if the player mines in the west direction, they will be able to spawn Worms.
 * Because the Armadillo Pet digs a 3 block high tunnel, it cannot spawn Worms unless digging at the very top of the Hollows.