Digger

Type	Burrowing Enemy
Environment	Underground Cavern
AI Type	Worm AI
Max Life	200/400/600
KB Resist	100%
Banner	Worm Banner
Immune to
Coins	3750
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav
Digging	https://terraria.wiki.gg/wiki/File:Roar_1.wav

The Digger is a worm-type enemy that appears in the Underground and Cavern layers in Hardmode. It completely replaces the Pre-Hardmode Giant Worm. Giant Worms still spawn rarely, but share kill count and banner.

Segments

Classic

Expert

Master

2 values: Pre-Hardmode › Hardmode
3 values: Pre-Hardmode › Hardmode › Post-Plantera

Diggers consist of 10-14 segments in total.

NPC ID		Damage	Defense
95	Digger Head	45/90/135	10
96	Digger Body	28/56›56›50/84›84›75	20
97	Digger Tail	26/52/78	30

Tips

As with all worm-type Enemies, Diggers can be easily killed with Spears, as the Spear can travel through Blocks and can hit multiple of the Digger's segments, drastically increasing damage output.
Much like the World Feeder, if the Cursed Inferno debuff is inflicted to multiple segments, damage can quickly rack up.
Since the Digger shares the same kill count and Banner as the Giant Worm, Worm Banners obtained Pre-Hardmode can be useful for fighting Diggers.

Trivia

The Bestiary entry for the Digger: "Exposure to the effects of ancient magicks flowing throughout the cracks of the world causes unusual rapid growths in giant worms."