Medium humanoid (human, shapechanger), chaotic evil

Armor Class 11 (11 in humanoid form, 12 in wolf or hybrid form)
Hit Points 58 (9d8 + 18)
Speed 30 ft. (40 ft. in wolf form)

STR	DEX	CON	INT	WIS	CHA
15 (+2)	13 (+1)	14 (+2)	10 (+0)	11 (+0)	10 (+0)

Saving Throws
Skills Perception +4, Stealth +3
Damage Resistances
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities
Senses passive Perception 14
Languages Common (can't speak in wolf form)
Challenge 3 (700 XP)

Shapechanger. The werewolf can use its action to polymorph into a wolf-humanoid hybrid or into a wolf, or back into its true form, which is humanoid. Its statistics, other than its AC, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Keen Hearing and Smell. The werewolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Actions

Multiattack (Humanoid or Hybrid Form Only). The werewolf makes two attacks: one with its bite and one with its claws or spear.

Bite (Wolf or Hybrid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage. If the target is a humanoid, it must succeed on a DC 12 Constitution saving throw or be cursed with werewolf lycanthropy.

Claws (Hybrid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (2d4 + 2) slashing damage.

Spear (Humanoid Form Only). Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one creature. Hit: 5 (1d6 + 2) piercing damage, or 6 (1d8 + 2) piercing damage if used with two hands to make a melee attack.

Medium humanoid (human, shapechanger), neutral

Armor Class 12
Hit Points 120 (16d8 + 48)
Speed 30 ft. (40 ft. in tiger form)

STR	DEX	CON	INT	WIS	CHA
17 (+3)	15 (+2)	16 (+3)	10 (+0)	13 (+1)	11 (+0)

Saving Throws 
Skills Perception +5, Stealth +4
Damage Resistances 
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities 
Senses darkvision 60 ft., passive Perception 15
Languages Common (can't speak in tiger form)
Challenge 4 (1100 XP)

Shapechanger. The weretiger can use its action to polymorph into a tiger-humanoid hybrid or into a tiger, or back into its true form, which is humanoid. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Keen Hearing and Smell. The weretiger has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pounce (Tiger or Hybrid Form Only). If the weretiger moves at least 15 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the weretiger can make one bite attack against it as a bonus action.

Actions

Multiattack (Humanoid or Hybrid Form Only). In humanoid form, the weretiger makes two scimitar attacks or two longbow attacks. In hybrid form, it can attack like a humanoid or make two claw attacks.

Bite (Tiger or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 3) piercing damage. If the target is a humanoid, it must succeed on a DC 13 Constitution saving throw or be cursed with weretiger lycanthropy.

Claw (Tiger or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage.

Scimitar (Humanoid or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

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

Medium humanoid (human, shapechanger), lawful evil

Armor Class 12
Hit Points 33 (6d8 + 6)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
10 (+0)	15 (+2)	12 (+1)	11 (+0)	10 (+0)	8 (-1)

Saving Throws 
Skills Perception +2, Stealth +4
Damage Resistances 
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities 
Senses darkvision 60 ft. (rat form only), passive Perception 12
Languages Common (can't speak in rat form)
Challenge 2 (450 XP)

Shapechanger. The wererat can use its action to polymorph into a rat-humanoid hybrid or into a giant rat, or back into its true form, which is humanoid. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Keen Smell. The wererat has advantage on Wisdom (Perception) checks that rely on smell.

Actions

Multiattack (Humanoid or Hybrid Form Only). The wererat makes two attacks, only one of which can be a bite.

Bite (Rat or Hybrid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage. If the target is a humanoid, it must succeed on a DC 11 Constitution saving throw or be cursed with wererat lycanthropy.

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

Hand Crossbow (Humanoid or Hybrid Form Only). Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Medium humanoid (human, shapechanger), neutral evil

Armor Class 10 (10 in humanoid form, 11 in boar or hybrid form)
Hit Points 78 (12d8 + 24)
Speed 30 ft. (40 ft. in boar form)

STR	DEX	CON	INT	WIS	CHA
17 (+3)	10 (+0)	15 (+2)	10 (+0)	11 (+0)	8 (-1)

Saving Throws 
Skills Perception +2
Damage Resistances 
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities 
Senses passive Perception 12
Languages Common (can't speak in boar form)
Challenge 4 (1100 XP)

Shapechanger. The wereboar can use its action to polymorph into a boar-humanoid hybrid or into a boar, or back into its true form, which is humanoid. Its statistics, other than its AC, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Charge (Boar or Hybrid Form Only). If the wereboar moves at least 15 feet straight toward a target and then hits it with its tusks on the same turn, the target takes an extra 7 (2d6) slashing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Relentless (Recharges after a Short or Long Rest). If the wereboar takes 14 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead.

Actions

Multiattack (Humanoid or Hybrid Form Only). The wereboar makes two attacks, only one of which can be with its tusks.

Maul (Humanoid or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage.

Tusks (Boar or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) slashing damage. If the target is a humanoid, it must succeed on a DC 12 Constitution saving throw or be cursed with wereboar lycanthropy.

Medium humanoid (human, shapechanger), neutral good

Armor Class 10 (10 in humanoid form, 11 in bear and hybrid form)
Hit Points 135 (18d8 + 54)
Speed 30 ft. (40 ft., climb 30 ft. in bear or hybrid form)

STR	DEX	CON	INT	WIS	CHA
19 (+4)	10 (+0)	17 (+3)	11 (+0)	12 (+1)	12 (+1)

Saving Throws 
Skills Perception +7
Damage Resistances 
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities 
Senses passive Perception 17
Languages Common (can't speak in bear form)
Challenge 5 (1800 XP)

Shapechanger. The werebear can use its action to polymorph into a Large bear-humanoid hybrid or into a Large bear, or back into its true form, which is humanoid. Its statistics, other than its size and AC, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Keen Smell. The werebear has advantage on Wisdom (Perception) checks that rely on smell.

Actions

Multiattack. In bear form, the werebear makes two claw attacks. In humanoid form, it makes two greataxe attacks. In hybrid form, it can attack like a bear or a humanoid.

Bite (Bear or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage. If the target is a humanoid, it must succeed on a DC 14 Constitution saving throw or be cursed with werebear lycanthropy.

Claw (Bear or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Greataxe (Humanoid or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (1d12 + 4) slashing damage.

Medium monstrosity (shapechanger), neutral

Armor Class 12 (natural armor)
Hit Points 58 (9d8 + 18)
Speed 15 ft.

STR	DEX	CON	INT	WIS	CHA
17 (+3)	12 (+1)	15 (+2)	5 (-3)	13 (+1)	8 (-1)

Saving Throws 
Skills Stealth +5
Damage Resistances 
Damage Immunities acid
Condition Immunities prone
Senses darkvision 60 ft., passive Perception 11
Languages --
Challenge 2 (450 XP)

Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Adhesive (Object Form Only). The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.

Actions

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) acid damage.

Medium undead (shapechanger), lawful evil

Armor Class 16 (natural armor)
Hit Points 144 (17d8 + 68)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	18 (+4)	18 (+4)	17 (+3)	15 (+2)	18 (+4)

Saving Throws Dex +9, Wis +7, Cha +9
Skills Perception +7, Stealth +9
Damage Resistances necrotic; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities 
Condition Immunities 
Senses darkvision 120 ft., passive Perception 17
Languages the languages it knew in life
Challenge 13 (10000 XP)

Shapechanger. If the vampire isn’t in sunlight or running water, it can use its action to polymorph into a Tiny bat or a Medium cloud of mist, or back into its true form. While in bat form, the vampire can’t speak, its walking speed is 5 feet, and it has a flying speed of 30 feet. Its statistics, other than its size and speed, are unchanged. Anything it is wearing transforms with it, but nothing it is carrying does. It reverts to its true form if it dies. While in mist form, the vampire can’t take any actions, speak, or manipulate objects. It is weightless, has a flying speed of 20 feet, can hover, and can enter a hostile creature’s space and stop there. In addition, if air can pass through a space, the mist can do so without squeezing, and it can’t pass through water. It has advantage on Strength, Dexterity, and Constitution saving throws, and it is immune to all nonmagical damage, except the damage it takes from sunlight.

Legendary Resistance (3/Day). If the vampire fails a saving throw, it can choose to succeed instead.

Misty Escape. When it drops to 0 hit points outside its resting place, the vampire transforms into a cloud of mist (as in the Shapechanger trait) instead of falling unconscious, provided that it isn’t in sunlight or running water. If it can’t transform, it is destroyed. While it has 0 hit points in mist form, it can’t revert to its vampire form, and it must reach its resting place within 2 hours or be destroyed. Once in its resting place, it reverts to its vampire form. It is then paralyzed until it regains at least 1 hit point. After spending 1 hour in its resting place with 0 hit points, it regains 1 hit point.

Regeneration. The vampire regains 20 hit points at the start of its turn if it has at least 1 hit point and isn’t in sunlight or running water. If the vampire takes radiant damage or damage from holy water, this trait doesn’t function at the start of the vampire’s next turn.

Spider Climb. The vampire can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Vampire Weaknesses. The vampire has the following flaws:
Forbiddance. The vampire can’t enter a residence without an invitation from one of the occupants.

Harmed by Running Water. The vampire takes 20 acid damage if it ends its turn in running water.
Stake to the Heart. If a piercing weapon made of wood is driven into the vampire’s heart while the vampire is incapacitated in its resting place, the vampire is paralyzed until the stake is removed. Sunlight Hypersensitivity. The vampire takes 20 radiant damage when it starts its turn in sunlight. While in sunlight, it has disadvantage on attack rolls and ability checks.

Actions

Multiattack (Vampire Form Only). The vampire makes two attacks, only one of which can be a bite attack.

Unarmed Strike (Vampire Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 8 (1d8 + 4) bludgeoning damage. Instead of dealing damage, the vampire can grapple the target (escape DC 18).

Bite (Bat or Vampire Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampire, incapacitated, or restrained. Hit: 7 (1d6 + 4) piercing damage plus 10 (3d6) necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the vampire regains hit points equal to that amount. The 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 in this way and then buried in the ground rises the following night as a vampire spawn under the vampire’s control.

Charm. The vampire targets one humanoid it can see within 30 feet of it. If the target can see the vampire, the target must succeed on a DC 17 Wisdom saving throw against this magic or be charmed by the vampire. The charmed target regards the vampire as a trusted friend to be heeded and protected. Although the target isn’t under the vampire’s control, it takes the vampire’s requests or actions in the most favorable way it can, and it is a willing target for the vampire’s bite attack. Each time the vampire or the vampire’s companions do anything harmful to the target, it can repeat the saving throw, ending the effect on itself on a success. Otherwise, the effect lasts 24 hours or until the vampire is destroyed, is on a different plane of existence than the target, or takes a bonus action to end the effect.

Children of the Night (1/Day). The vampire magically calls 2d4 swarms of bats or rats, provided that the sun isn’t up. While outdoors, the vampire can call 3d6 wolves instead. The called creatures arrive in 1d4 rounds, acting as allies of the vampire and obeying its spoken commands. The beasts remain for 1 hour, until the vampire dies, or until the vampire dismisses them as a bonus action.

Legendary Actions

The vampire can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The vampire regains spent legendary actions at the start of its turn.

Move. The vampire moves up to its speed without provoking opportunity attacks.

Unarmed Strike. The vampire makes one unarmed strike.

Bite (Costs 2 Actions). The vampire makes one bite attack.

Medium fiend (shapechanger), neutral evil

Armor Class 15 (natural armor)
Hit Points 66 (12d8 + 12)
Speed 30 ft., fly 60 ft.

STR	DEX	CON	INT	WIS	CHA
8 (-1)	17 (+3)	13 (+1)	15 (+2)	12 (+1)	20 (+5)

Saving Throws
Skills Deception +9, Insight +5, Perception +5, Persuasion +9, Stealth +7
Damage Resistances cold, fire, lightning, poison; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities
Condition Immunities
Senses darkvision 60 ft., passive Perception 15
Languages Abyssal, Common, Infernal, telepathy 60 ft.
Challenge 4 (1100 XP)

Telepathic Bond. The fiend ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don’t even need to be on the same plane of existence.

Shapechanger. The fiend can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Without wings, the fiend loses its flying speed. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Actions

Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Charm. One humanoid the fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend’s verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend’s Charm for the next 24 hours. The fiend can have only one target charmed at a time. If it charms another, the effect on the previous target ends.

Draining Kiss. The fiend kisses a creature charmed by it or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking 32 (5d10 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target’s 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.

Etherealness. The fiend magically enters the Ethereal Plane from the Material Plane, or vice versa.