Grimlock

Grimlock CR: 1/4

Medium humanoid (grimlock), neutral evil

Armor Class: 11

Hit Points: 11 2d8+2

Speed: 30 ft

STR

16 +3

DEX

12 +1

CON

12 +1

INT

9 -1

WIS

8 -1

CHA

6 -2

Skills: Athletics +5, Perception +3, Stealth +3

Condition Immunities: Blinded

Senses: Blindsight 30 ft, or 10 ft while deafened (blind beyond this radius), passive Perception 13

Languages: Undercommon

Challenge Rating: 1/4

Blind Senses. The grimlock can't use it's Blindsight while deafened and unable to smell.
Keen Hearing and Smell. The grimlock has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Stone Camouflage. The grimlock has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.

Actions

Spiked Bone Club. Melee Weapon Attack +5 to hit, reach 5ft, one target. Hit 5 1d4+3 bludgeoning damage plus 2 1d4 piercing damage.

Grimlocks are an ancient offshoot of humanity. They have existed in the Underdark for millennia, and are now blind having lost the used of their eyes.
The grimlocks are descended from early humans who came from Africa into the Middle East and Europe when humanity was still young. They would use the caves they found as shelter when necessary, and for religious purposes, and for burials. Eventually a few here and there made their way deeper into the Underdark, and were discovered by an ancient evil buried long ago in some of the cave systems. There, this primeval deity turned them into a cult who worshipped it, and drove them forward to attack other Underdark empires. Eventually the deity and it's army was defeated by more experienced militaries, such as the Black Elves, and the Dwarves. Whatever happed to the deity, or even it's name, is barely remembered except in hushed myths and legends across the Underdark.
Whispers are still spread around many with ties to these cultures of attacks by mutated creatures with their eyes permanently shut, with straggly black hair, and greyish skin. They are construed as having pointed ears, using primitive spiked clubs, wearing the skins & hides of their prey, and cannibal tendencies. When an attack is made, they leave behind a messy kill, carrying off unfortunates where they eat them in underground lairs strewn with the corpses remnants, blood & viscera everywhere and their own dung mixed in. When on the hunt they can blend into the rock with the skin colouring.

Suggested Environments

The Underdark.