Skeleton

Skeleton Medium undead, lawful evil 1/4 50 xp

Armor class 13 (armor scraps)
Hit points 13 (2d8+4)
Speed 30 ft.

STR 10 (0)
DEX 14 (+2)
CON 15 (+2)
INT 6 (-2)
WIS 8 (-1)
CHA 5 (-3)

Damage Immunities: poison

Condition Immunities: exhaustion, poisoned

Senses: darkvision 60 ft., passive Perception 9

Languages: understands all languages it knew in life but can't speak

Challenge: 1/4 (50 xp)

Damage Vulnerabilities: bludgeoning

Actions

Shortsword. Melee Weapon Attack: +4 to hit, reach 5 ft., one target.
Hit: 5 (1d6 + 2) piercing damage.

Shortbow. Ranged Weapon Attack: +4 to hit, range 80/320 ft, one target.
Hit: 5 (1d6 + 2) piercing damage.

Zombie

Zombie Medium undead, neutral evil 1/4 50 xp

Armor class 8
Hit points 22 (3d8+9)
Speed 20 ft.

STR 13 (+1)
DEX 6 (-2)
CON 16 (+3)
INT 3 (-4)
WIS 6 (-2)
CHA 5 (-3)

Damage Immunities: poison

Condition Immunities: poisoned

Senses: darkvision 60 ft., passive Perception 8

Languages: understands all languages it knew in life but can't speak

Challenge: 1/4 (50 xp)

Actions

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Specter

Specter Medium undead, chaotic evil 1 200 xp

Armor class 12
Hit points 22 (5d8)
Speed 0 ft., fly 50 ft. (hover)

STR 1 (-5)
DEX 14 (+2)
CON 11 (0)
INT 10 (0)
WIS 10 (0)
CHA 11 (0)

Damage Resistances: acid, cold, fire, lightning, thunder, bludgeoning, piercing and slashing from nonmagical weapons

Damage Immunities: necrotic, poison

Condition Immunities: charmed, exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconcious

Senses: darkvision 60 ft., passive Perception 10

Languages: can't speak

Challenge: 1 (200 xp)

Incorporeal Movement. The specter can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Sunlight Sensitivity. While in sunlight, the specter has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Actions

Life Drain. Melee Spell Attack: +4 to hit, reach 5 ft. , one creature.
Hit: 10 (3d6) necrotic damage. The target must succeed on a DC 10 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Wight

Wight Medium undead, neutral evil 3 700 xp

Armor class 14 (studded leather)
Hit points 45 (6d8+18)
Speed 30 ft.

STR 15 (+2)
DEX 14 (+2)
CON 16 (+3)
INT 10 (0)
WIS 13 (+1)
CHA 15 (+2)

Skills: Perception +3, Stealth +4

Damage Resistances: necrotic, bludgeoning, piercing and slashing from nonmagical weapons that aren't silvered

Damage Immunities: poison

Condition Immunities: exhaustion, poisoned

Senses: darkvision 60 ft., PP 13

Languages: the languages it knew in life

Challenge: 3 (700 xp)

Sunlight Sensitivity. While in sunlight, the wight has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Actions

Multiattack. The wight makes two longsword attacks or
two longbow attacks. It can use its Life Drain in place of one longsword attack.

Life Drain. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature.
Hit: 5 (1d6 + 2) necrotic damage. The target must succeed on a DC 13 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
A humanoid slain by this attack rises 24 hours later as a zombie under the wight's control, unless the humanoid is restored to life or its body is destroyed. The wight can have no more than twelve zombies under its control at one time.

Longsword. Melee Weapon Attack: +4 to hit, reach 5 ft., one target.
Hit: 6 (1d8 + 2) slashing damage, or 7 (1d10 + 2) slashing damage if used with two hands.

Longbow. Ranged Weapon Attack: +4 to hit, range 150/600 ft., one target.
Hit: 6 (1d8 + 2) piercing damage.