Large monstrosity, chaotic evil

Armor Class 19 (natural armor)
Hit Points 123 (13d10 + 52)
Speed 30 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	16 (+3)	18 (+4)	13 (+1)	14 (+2)	12 (+1)

Saving Throws 
Skills Perception +5, Stealth +9
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses darkvision 120 ft., passive Perception 15
Languages Elvish, Undercommon
Challenge 6 (2300 XP)

Fey Ancestry. The drider has advantage on saving throws against being charmed, and magic can’t put the drider to sleep.

Innate Spellcasting. The drider’s innate spellcasting ability is Wisdom (spell save DC 13). The drider can innately cast the following spells, requiring no material components: At will: ““ 1/day each: ““, ““

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

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

Web Walker. The drider ignores movement restrictions caused by webbing.

Actions

Multiattack. The drider makes three attacks, either with its longsword or its longbow. It can replace one of those attacks with a bite attack.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 2 (1d4) piercing damage plus 9 (2d8) poison damage.

Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage, or 8 (1d10 + 3) slashing damage if used with two hands.

Longbow. Ranged Weapon Attack: +6 to hit, range 150/600 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) poison damage.

Tiny beast, unaligned

Armor Class 14
Hit Points 5 (2d4)
Speed 30 ft., fly 60 ft., swim 30 ft.

STR	DEX	CON	INT	WIS	CHA
4 (-3)	18 (+4)	11 (+0)	2 (-4)	12 (+1)	5 (-3)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses blindsight 10 ft., passive Perception 11
Languages --
Challenge 44934 (25 XP)

Flyby. The snake doesn’t provoke opportunity attacks when it flies out of an enemy’s reach.

Actions

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage plus 7 (3d4) poison damage. A flying snake is a brightly colored, winged serpent found in remote jungles. Tribespeople and cultists sometimes domesticate flying snakes to serve as messengers that deliver scrolls wrapped in their coils.

Medium celestial, lawful good

Armor Class 19 (natural armor)
Hit Points 97 (13d8 + 39)
Speed 30 ft., fly 90 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	20 (+5)	17 (+3)	18 (+4)	20 (+5)	18 (+4)

Saving Throws Con +5, Wis +7, Cha +6
Skills 
Damage Resistances radiant
Damage Immunities psychic; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities 
Senses truesight 120 ft., passive Perception 15
Languages all, telepathy 120 ft.
Challenge 4 (1100 XP)

Innate Spellcasting. The couatl’s spellcasting ability is Charisma (spell save DC 14). It can innately cast the following spells, requiring only verbal components: At will: ““, ““, ““ 3/day each: ““, ““, ““, ““, ““, ““, ““ 1/day each: ““, ““, ““

Magic Weapons. The couatl’s weapon attacks are magical.

Shielded Mind. The couatl is immune to scrying and to any effect that would sense its emotions, read its thoughts, or detect its location.

Actions

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 8 (1d6 + 5) piercing damage, and the target must succeed on a DC 13 Constitution saving throw or be poisoned for 24 hours. Until this poison ends, the target is unconscious. Another creature can use an action to shake the target awake.

Constrict. Melee Weapon Attack: +6 to hit, reach 10 ft., one Medium or smaller creature. Hit: 10 (2d6 + 3) bludgeoning damage, and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the couatl can’t constrict another target.

Change Shape. The couatl magically polymorphs into a humanoid or beast that has a challenge rating equal to or less than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the couatl’s choice). In a new form, the couatl retains its game statistics and ability to speak, but its AC, movement modes, Strength, Dexterity, and other actions are replaced by those of the new form, and it gains any statistics and capabilities (except class features, legendary actions, and lair actions) that the new form has but that it lacks. If the new form has a bite attack, the couatl can use its bite in that form.

Tiny beast, unaligned

Armor Class 11 (natural armor)
Hit Points 2 (1d4)
Speed 20 ft., swim 20 ft.

STR	DEX	CON	INT	WIS	CHA
2 (-4)	11 (+0)	10 (+0)	1 (-5)	8 (-1)	2 (-4)

Saving Throws
Skills Stealth +2
Damage Resistances
Damage Immunities
Condition Immunities
Senses blindsight 30 ft., passive Perception 9
Languages --
Challenge 0 (10 XP)

Amphibious. The crab can breathe air and water.

Actions

Claw. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage.

Large beast, unaligned

Armor Class 12 (natural armor)
Hit Points 19 (3d10 + 3)
Speed 20 ft., swim 30 ft.

STR	DEX	CON	INT	WIS	CHA
15 (+2)	10 (+0)	13 (+1)	2 (-4)	10 (+0)	5 (-3)

Saving Throws
Skills Stealth +2
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 10
Languages --
Challenge 44928 (100 XP)

Hold Breath. The crocodile can hold its breath for 15 minutes.

Actions

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (1d10 + 2) piercing damage, and the target is grappled (escape DC 12). Until this grapple ends, the target is restrained, and the crocodile can’t bite another target.

Medium humanoid (any race), any non-good alignment

Armor Class 13 (leather armor)
Hit Points 33 (6d8 + 6)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
11 (+0)	14 (+2)	12 (+1)	10 (+0)	13 (+1)	14 (+2)

Saving Throws
Skills Deception +4, Persuasion +4, Religion +2
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 11
Languages any one language (usually Common)
Challenge 2 (450 XP)

Dark Devotion. The fanatic has advantage on saving throws against being charmed or frightened.

Spellcasting. The fanatic is a 4th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 11, +3 to hit with spell attacks). The fanatic has the following cleric spells prepared: Cantrips (at will): ““, ““, ““ 1st level (4 slots): ““, ““, ““ 2nd level (3 slots): ““, ““

Actions

Multiattack. The fanatic makes two melee attacks.

Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one creature. Hit_: 4 (1d4 + 2) piercing damage. Fanatics are often part of a cult’s leadership, using their charisma and dogma to influence and prey on those of weak will. Most are interested in personal power above all else.

Medium humanoid (any race), any non-good alignment

Armor Class 12 (leather armor)
Hit Points 9 (2d8)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
11 (+0)	12 (+1)	10 (+0)	10 (+0)	11 (+0)	10 (+0)

Saving Throws
Skills Deception +2, Religion +2
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 10
Languages any one language (usually Common)
Challenge 44934 (25 XP)

Dark Devotion. The cultist has advantage on saving throws against being charmed or frightened.

Actions

Scimitar. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 4 (1d6 + 1) slashing damage. Cultists swear allegiance to dark powers such as elemental princes, demon lords, or archdevils. Most conceal their loyalties to avoid being ostracized, imprisoned, or executed for their beliefs. Unlike evil acolytes, cultists often show signs of insanity in their beliefs and practices.

Small monstrosity, unaligned

Armor Class 11
Hit Points 22 (5d6 + 5)
Speed 10 ft., fly 30 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	12 (+1)	13 (+1)	2 (-4)	10 (+0)	0 (-3)

Saving Throws 
Skills Stealth +3
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses blindsight 60 ft., passive Perception 10
Languages --
Challenge 44928 (100 XP)

Echolocation. The darkmantle can’t use its blindsight while deafened.

False Appearance. While the darkmantle remains motionless, it is indistinguishable from a cave formation such as a stalactite or stalagmite.

Actions

Crush. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) bludgeoning damage, and the darkmantle attaches to the target. If the target is Medium or smaller and the darkmantle has advantage on the attack roll, it attaches by engulfing the target’s head, and the target is also blinded and unable to breathe while the darkmantle is attached in this way. While attached to the target, the darkmantle can attack no other creature except the target but has advantage on its attack rolls. The darkmantle’s speed also becomes 0, it can’t benefit from any bonus to its speed, and it moves with the target. A creature can detach the darkmantle by making a successful DC 13 Strength check as an action. On its turn, the darkmantle can detach itself from the target by using 5 feet of movement.

Darkness Aura (1/Day). A 15-foot radius of magical darkness extends out from the darkmantle, moves with it, and spreads around corners. The darkness lasts as long as the darkmantle maintains concentration, up to 10 minutes (as if concentrating on a spell). Darkvision can’t penetrate this darkness, and no natural light can illuminate it. If any of the darkness overlaps with an area of light created by a spell of 2nd level or lower, the spell creating the light is dispelled.

Large beast, unaligned

Armor Class 10
Hit Points 19 (3d10 + 3)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	10 (+0)	12 (+1)	2 (-4)	11 (+0)	7 (-2)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 10
Languages --
Challenge 44930 (50 XP)

Actions

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (2d4 + 4) bludgeoning damage.

Medium monstrosity, neutral evil

Armor Class 12
Hit Points 39 (6d8 + 12)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
15 (+2)	14 (+2)	14 (+2)	3 (-4)	13 (+1)	6 (-2)

Saving Throws
Skills Perception +5, Stealth +4
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 120 ft., passive Perception 15
Languages --
Challenge 1 (200 XP)

Two-Headed. The dog has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious.

Actions

Multiattack. The dog makes two bite attacks.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage. If the target is a creature, it must succeed on a DC 12 Constitution saving throw against disease or become poisoned until the disease is cured. Every 24 hours that elapse, the creature must repeat the saving throw, reducing its hit point maximum by 5 (1d10) on a failure. This reduction lasts until the disease is cured. The creature dies if the disease reduces its hit point maximum to 0. A death dog is an ugly two-headed hound that roams plains, and deserts. Hate burns in a death dog’s heart, and a taste for humanoid flesh drives it to attack travelers and explorers. Death dog saliva carries a foul disease that causes a victim’s flesh to slowly rot off the bone.