Ancient Shadow

Medium undead, chaotic evil
Armor Class 13 (natural armor)
Hit Points 32 (5d8 + 10)
Speed 40 ft.
STR
6 (-2)
DEX
16 (+3)
CON
14 (+2)
INT
6 (-2)
WIS
10 (+0)
CHA
8 (-1)
Skills Stealth +5 (+7 in dim light or darkness)
Damage Vulnerabilities radiant
Damage Resistances acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities necrotic, poison
Condition Immunities exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 60 ft., passive Perception 10
Languages
Challenge 1 (200 XP)

Amorphous. The shadow can move through a space as narrow as 1 inch wide without squeezing.

Shadow Stealth. While in dim light or darkness, the shadow can take the Hide action as a bonus action.

Sunlight Weakness. While in sunlight, the shadow has disadvantage on attack rolls, ability checks, and saving throws.

Actions

Strength Drain. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) necrotic damage, and the target's Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or long rest. If a non-evil humanoid dies from this attack, a new shadow (CR 1/2) rises from the corpse 1d2 hours later.

Extra (AideDD)