The Quiet Ones

Large beasts
Seen as abyssal underworld dragons by the sulits. The dwarfs see them as the ancient threat defeated by their gods.
First appeared during the second disintegration. later came back around the third disintegration.

Statblocks

Quiet One, Adult CR: 8

Huge rift abomination (beast), unaligned

Armor Class: 23

Hit Points: 152 16d10+64

Speed: 40 ft , burrow: 40 ft

STR

19 +4

DEX

8 -1

CON

18 +4

INT

4 -3

WIS

12 +1

CHA

8 -1

Saving Throws: Con +6

Skills: Perception +7

Damage Vulnerabilities: Poison

Senses: Blind. The Quiet one is almost totally blind, only being able to discern big flashes of brightness.
Deaf. The Quiet One is fully deaf.
Amazing Smell. The Quiet One mostly relies on its smell. The smell can be treated as 30 ft blind sense.

Challenge Rating: 8

No Breathing. The Quiet One doesn't need to breath and are unaffected by poisons in the air.
Quiet. The Quiet Ones are totally quiet. Even when digging they cannot be heard even by the sharpest ears.
Disintegrate Immunity. The Quiet One uses disintegrate magic to dig through the earth and has gained immunity to the spell.

Actions

Disintegrate (4-6) The Quiet one unleashes a green cloud of disintegrating magic directly in front of it. All creations of magical force and non-magical objects, not being carried, in the area are disintegrated. Any creature in the area can make a DC 15 dexterity saving throw to try to jump out of the area to a space within 5 ft of it. A creature which has no place to jump to automatically fails the save. On a failed save the creature takes 4d6+20 force damage. If this damage reduces the target to 0 hit points, it is disintegrated. A disintegrated creature and everything it is wearing and carrying, except magic items, are reduced to a pile of fine gray dust. The creature can be restored to life only by means of a true resurrection or a wish spell.

Additional Information

Perception and Sensory Capabilities

No hearing nor sight but extremly good smell.