5e SRD >Creatures >

Tunnel Worm

Huge monstrosity, neutral

Armor Class 13 (natural armor)
Hit Points 149 (13d12 + 65)
Speed 20 ft., burrow 20 ft.

21 (+5) 13 (+1) 21 (+5) 1 (-5) 10 (+0) 6 (-2)

Condition Immunities prone
Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 10
Languages —
Challenge 5 (1,800 XP)

Special Traits

  • Rend Armor. When the tunnel worm hits a creature wearing nonmagical armor or carrying a shield with its bite attack, the armor or shield takes a permanent -1 penalty to the AC it offers. Armor reduced to an AC of 10 or a shield that drops to +0 bonus is destroyed. A damaged shield or suit of armor can be repaired by a blacksmith.


  • Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 26 (6d6 + 5) piercing damage, and the target is grappled (escape DC 16). Until this grapple ends, the target is restrained. The tunnel worm can bite only the grappled creature and has advantage on attack rolls to do so.


This massive creature appears to be a 30-foot-long sleek black centipede with a long segmented body and many slender legs. Its huge mandibles are serrated and razor-sharp, and its eyes are multifaceted. A ring of chitinous bone protects its oversized head.

The tunnel worm is a burrowing creature related to the monstrous centipede. It is a very aggressive predator and hunter, though it can sustain itself by scavenging. Its preferred food is fresh, raw meat. Tunnel worms are very aggressive and attack anything that enters their territory.

Tunnel worms live in mazelike complexes of burrows connected by passages they have chewed out over time; these burrows are often filled with the rotting remains of past prey, used by the worm to incubate its offspring. The favored tactic of the tunnel worm is to lurk beneath the surface of the ground or behind a wall until it senses a creature moving by, whereupon it burrows out to surprise and attack its prey (treat this attack as a charge attack). A tunnel worm that has taken more than half its hit points in damage retreats to its lair unless it is cornered, in which case it fights to the death.

A typical tunnel worm is 30 feet long but can grow to a length of 60 feet.

Section 15: Copyright Notice

Rappan Athuk © 2018, Frog God Games, LLC; Authors Bill Webb, Clark Peterson, Skeeter Green, Tom Knauss, Lance Hawvermale, WDB Kenower, Casey Christofferson, and Greg Raglund; based on the original creation of Bill Webb.

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