Large aberration, chaotic evil

Armor Class 16 (natural armor)
Hit Points 93 (11d10 + 33)
Speed 30 ft., swim 30 ft.

STR	DEX	CON	INT	WIS	CHA
19 (+4)	10 (+0)	16 (+3)	5 (-3)	11 (+0)	5 (-3)

Saving Throws 
Skills Perception +4
Damage Resistances 
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 14
Languages understands Deep Speech but can't speak
Challenge 4 (1100 XP)

Amphibious. The chuul can breathe air and water.

Sense Magic. The chuul senses magic within 120 feet of it at will. This trait otherwise works like the ““ spell but isn’t itself magical.

Actions

Multiattack. The chuul makes two pincer attacks. If the chuul is grappling a creature, the chuul can also use its tentacles once.

Pincer. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage. The target is grappled (escape DC 14) if it is a Large or smaller creature and the chuul doesn’t have two other creatures grappled.

Tentacles. One creature grappled by the chuul must succeed on a DC 13 Constitution saving throw or be poisoned for 1 minute. Until this poison ends, the target is paralyzed. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Large aberration, chaotic neutral

Armor Class 14 (natural armor)
Hit Points 78 (12d10 + 12)
Speed 10 ft., fly 40 ft.

STR	DEX	CON	INT	WIS	CHA
17 (+3)	15 (+2)	12 (+1)	13 (+1)	12 (+1)	14 (+2)

Saving Throws
Skills Stealth +5
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 60 ft., passive Perception 11
Languages Deep Speech, Undercommon
Challenge 8 (3900 XP)

Damage Transfer. While attached to a creature, the cloaker takes only half the damage dealt to it (rounded down), and that creature takes the other half.

False Appearance. While the cloaker remains motionless without its underside exposed, it is indistinguishable from a dark leather cloak.

Light Sensitivity. While in bright light, the cloaker has disadvantage on attack rolls and Wisdom (Perception) checks that rely on sight.

Actions

Multiattack. The cloaker makes two attacks: one with its bite and one with its tail.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) piercing damage, and if the target is Large or smaller, the cloaker attaches to it. If the cloaker has advantage against the target, the cloaker attaches to the target’s head, and the target is blinded and unable to breathe while the cloaker is attached. While attached, the cloaker can make this attack only against the target and has advantage on the attack roll. The cloaker can detach itself by spending 5 feet of its movement. A creature, including the target, can take its action to detach the cloaker by succeeding on a DC 16 Strength check.

Tail. Melee Weapon Attack: +6 to hit, reach 10 ft., one creature. Hit: 7 (1d8 + 3) slashing damage.

Moan. Each creature within 60 feet of the cloaker that can hear its moan and that isn’t an aberration must succeed on a DC 13 Wisdom saving throw or become frightened until the end of the cloaker’s next turn. If a creature’s saving throw is successful, the creature is immune to the cloaker’s moan for the next 24 hours

Phantasms (Recharges after a Short or Long Rest). The cloaker magically creates three illusory duplicates of itself if it isn’t in bright light. The duplicates move with it and mimic its actions, shifting position so as to make it impossible to track which cloaker is the real one. If the cloaker is ever in an area of bright light, the duplicates disappear. Whenever any creature targets the cloaker with an attack or a harmful spell while a duplicate remains, that creature rolls randomly to determine whether it targets the cloaker or one of the duplicates. A creature is unaffected by this magical effect if it can’t see or if it relies on senses other than sight. A duplicate has the cloaker’s AC and uses its saving throws. If an attack hits a duplicate, or if a duplicate fails a saving throw against an effect that deals damage, the duplicate disappears.

Small monstrosity, unaligned

Armor Class 11
Hit Points 27 (6d6 + 6)
Speed 20 ft., fly 40 ft.

STR	DEX	CON	INT	WIS	CHA
6 (-2)	12 (+1)	12 (+1)	2 (-4)	13 (+1)	5 (-2)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 60 ft., passive Perception 11
Languages --
Challenge 44928 (100 XP)

Actions

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 3 (1d4 + 1) piercing damage, and the target must succeed on a DC 11 Constitution saving throw against being magically petrified. On a failed save, the creature begins to turn to stone and is restrained. It must repeat the saving throw at the end of its next turn. On a success, the effect ends. On a failure, the creature is petrified for 24 hours.

Medium humanoid (any race), any alignment

Armor Class 10
Hit Points 4 (1d8)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
10 (+0)	10 (+0)	10 (+0)	10 (+0)	10 (+0)	10 (+0)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 10
Languages any one language (usually Common)
Challenge 0 (10 XP)

Actions

Club. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 2 (1d4) bludgeoning damage. Commoners include peasants, serfs, slaves, servants, pilgrims, merchants, artisans, and hermits.

Large monstrosity, unaligned

Armor Class 17 (natural armor)
Hit Points 94 (9d10 + 45)
Speed 40 ft., burrow 40 ft.

STR	DEX	CON	INT	WIS	CHA
19 (+4)	11 (+0)	21 (+5)	2 (-4)	10 (+0)	5 (-3)

Saving Throws 
Skills Perception +6
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 16
Languages --
Challenge 5 (1800 XP)

Standing Leap. The bulette’s long jump is up to 30 feet and its high jump is up to 15 feet, with or without a running start.

Actions

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 30 (4d12 + 4) piercing damage.

Deadly Leap. If the bulette jumps at least 15 feet as part of its movement, it can then use this action to land on its feet in a space that contains one or more other creatures. Each of those creatures must succeed on a DC 16 Strength or Dexterity saving throw (target’s choice) or be knocked prone and take 14 (3d6 + 4) bludgeoning damage plus 14 (3d6 + 4) slashing damage. On a successful save, the creature takes only half the damage, isn’t knocked prone, and is pushed 5 feet out of the bulette’s space into an unoccupied space of the creature’s choice. If no unoccupied space is within range, the creature instead falls prone in the bulette’s space.

Medium beast, unaligned

Armor Class 11 (natural armor)
Hit Points 19 (3d8 + 6)
Speed 40 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
15 (+2)	10 (+0)	14 (+2)	2 (-4)	12 (+1)	7 (-2)

Saving Throws
Skills Perception +3
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 13
Languages --
Challenge 44928 (100 XP)

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

Actions

Multiattack. The bear makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.

Huge plant, unaligned

Armor Class 13 (natural armor)
Hit Points 59 (7d12 + 14)
Speed 20 ft.

STR	DEX	CON	INT	WIS	CHA
19 (+4)	6 (-2)	15 (+2)	10 (+0)	10 (+0)	7 (-2)

Saving Throws 
Skills 
Damage Resistances bludgeoning, piercing
Damage Immunities 
Condition Immunities 
Senses passive Perception 10
Languages one language known by its creator
Challenge 2 (450 XP)

False Appearance. While the tree remains motionless, it is indistinguishable from a normal tree.

Actions

Slam. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage. Anawakened tree is an ordinary tree given sentience and mobility by the ““ spell or similar magic.

Medium elemental, lawful neutral

Armor Class 17 (natural armor, shield)
Hit Points 39 (6d8 + 12)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
17 (+3)	12 (+1)	15 (+2)	12 (+1)	13 (+1)	10 (+0)

Saving Throws Con +4
Skills 
Damage Resistances 
Damage Immunities fire, poison
Condition Immunities poisoned
Senses passive Perception 11
Languages Ignan
Challenge 2 (450 XP)

Heated Body. A creature that touches the azer or hits it with a melee attack while within 5 feet of it takes 5 (1d10) fire damage.

Heated Weapons. When the azer hits with a metal melee weapon, it deals an extra 3 (1d6) fire damage (included in the attack).

Illumination. The azer sheds bright light in a 10-foot radius and dim light for an additional 10 feet.

Actions

Warhammer. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage, or 8 (1d10 + 3) bludgeoning damage if used with two hands to make a melee attack, plus 3 (1d6) fire damage.

Small beast, unaligned

Armor Class 12
Hit Points 3 (1d6)
Speed 30 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
8 (-1)	14 (+2)	11 (+0)	4 (-3)	12 (+1)	6 (-2)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 11
Languages --
Challenge 0 (10 XP)

Pack Tactics. The baboon has advantage on an attack roll against a creature if at least one of the baboon’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

Actions

Bite. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1 (1d4 − 1) piercing damage.

Tiny beast, unaligned

Armor Class 10
Hit Points 3 (1d4 + 1)
Speed 20 ft., burrow 5 ft.

STR	DEX	CON	INT	WIS	CHA
4 (-3)	11 (+0)	12 (+1)	2 (-4)	12 (+1)	5 (-3)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 30 ft., passive Perception 11
Languages --
Challenge 0 (10 XP)

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

Actions

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 1 piercing damage.