These scaly creatures resemble nothing so much as tiny, batwinged dragonkin.

Dragon Sprites. Chernomoi (which means “lair sprite” in Draconic) often reside discreetly in a dragon lair or dragonborn household, cleaning and tidying up at night, and only occasionally keeping a small trinket or shiny gemstone as compensation. They appear as tiny, winged dragonkin, dressed in metallic armor made of small coins and semi-precious stones.

Lair Alarms. Chernomoi are terrified of wyverns and never lair anywhere near them. Otherwise, they are very protective of their draconic masters and raise an alarm if an intruder is undetected. They fight with their tiny blades and Shriek attack if cornered, though they always flee from danger as a first option— usually straight to a dragon, dragonborn, or drake ally.

Chernomoi

Tiny fey, neutral
Armor Class 13
Hit Points 32 (5d4 + 20)
Speed 20 ft., fly 20 ft.

STR	DEX	CON	INT	WIS	CHA
9 (-1)	18 (+4)	18 (+4)	12 (+1)	11 (+0)	16 (+3)

Skills Acrobatics +6, Perception +2, Stealth +6
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks not made with silver weapons
Senses darkvision 60 ft., passive Perception 12
Languages Common, Draconic, Sylvan
Challenge 1 (200 XP)

Innate Spellcasting. The chernomoi’s innate spellcasting ability is Charisma (spell save DC 13). It can innately cast the following spells, requiring no material components:
At will: detect magic, invisibility, mage hand, mending, message, prestidigitation
1/day each: detect poison and disease, dimension door

Actions

Scimitar. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) slashing damage.

Shriek (Recharge 5-6). The chernomoi emits a loud shriek. All creatures within 60 feet who can hear take 10 (3d6) thunder damage, or half damage with a successful DC 13 Constitution saving throw.