Purple Worm

The massive burrowing monster known as the purple worm terrorizes the creatures of the Underdark as it chews through solid rock in pursuit of prey. A dimwitted, ravenous force of nature, this creature regards anything it encounters as food.
Ravenous Hunters Loud noise attracts purple worms, which have been known to interrupt underground battles and tear through subterranean cities seeking prey. The underground civilizations of the drow, the duergar, and the mind flayers maintain special wards around their settlements to deter these monsters. Though most common in the Underdark, purple worms are frequently seen on the surface world in rocky and mountainous lands. The maw of a purple worm is large enough to swallow a horse whole, and no creature is safe from its hunger. It lunges forward by rhythmically compressing and expanding its body, catching other Underdark dwellers by surprise with the speed of its advance.
Boons of the Worm When a purple worm burrows through the ground, it consumes earth and rock, which it breaks down and constantly excretes. Precious metals and gems can thus be found within the bodies of purple worms, which are targeted by particularly brave and foolhardy treasure hunters. A burrowing purple worm constantly creates new tunnels throughout the Underdark, which are quickly made use of by other creatures as corridors and highways. Because a purple worm rarely returns to its own tunnels, such passageways are a good place to avoid these monsters. Areas rich in prey quickly become interlaced with complex tunnel systems resulting from several worms hunting together.

Purple Worm

The massive burrowing monster known as the purple worm terrorizes the creatures of the Underdark as it chews through solid rock in pursuit of prey. A dimwitted, ravenous force of nature, this creature regards anything it encounters as food.

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Armor Class	18 (natural armor)
Hit Points	15d20+90
Speed	50 ft.	Burrow 30ft.
Strength	28 (+9)
Dexterity	7 (- 2)
Constitution	22 (+6)
Intelligence	1 (- 5)
Wisdom	8 (- 1)
Charisma	4 (- 3)
Saving Throws	Constitution d20+11	Wisdom d20+4
Senses	Blindsight 30ft.	Tremorsense 60 ft.	Passive Perception 9
Languages	---
Challenge	15 (13,000 XP)
Special	Tunneler	The worm can burrow through solid rock at half its burrow speed	and leaves a 10·foot·diameter tunnel in its wake
Action 1	Multiattack	The worm makes two attacks	one with its bite and one with its stinger
Action 2	Bite	Melee Weapon Attack	d20+9 to hit
Reach 10ft., one target	Hit 3d8+9 piercing damage.	If the target is a Large or smaller creature,	it must succeed on a DC 19 Dexterity saving throw
or be swallowed by the worm.	A swallowed creature is blinded and restrained,	it has total cover against attacks	and other effects outside the worm,
and it takes 6d6 acid damage at the start	of each of the worm's turns.	If the worm takes 30 damage	or more on a single turn from a creature inside it,
the worm must succeed on a DC 21 Constitution saving throw	at the end of that turn or regurgitate all swallowed creatures,	which fall prone in a space within 10 feet of the worm.	If the worm dies, a swallowed creature is
no longer restrained by it and can escape from	the corpse by using 20 feet	of movement, exiting prone
Action 3	Tail Stinger	Melee Weapon Attack	d20+9 to hit
Reach 10ft., one creature	Hit 3d6+9 piercing damage,	and the target must make a	DC 19 Constitution saving throw,
taking 12d6 poison damage on a failed save,	or half as much damage on a successful one