Medium undead, any alignment

Armor Class 11
Hit Points 45 (10d8)
Speed 0 ft., fly 40 ft. (hover)

STR	DEX	CON	INT	WIS	CHA
7 (-2)	13 (+1)	10 (+0)	10 (+0)	12 (+1)	17 (+3)

Saving Throws
Skills
Damage Resistances acid, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities cold, necrotic, poison
Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 60 ft., passive Perception 11
Languages any languages it knew in life
Challenge 4 (1100 XP)

Ethereal Sight. The ghost can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Incorporeal Movement. The ghost 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.

Actions

Withering Touch. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 17 (4d6 + 3) necrotic damage.

Etherealness. The ghost enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, and vice versa, yet it can’t affect or be affected by anything on the other plane.

Horrifying Visage. Each non-undead creature within 60 feet of the ghost that can see it must succeed on a DC 13 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 10 years. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target’s saving throw is successful or the effect ends for it, the target is immune to this ghost’s Horrifying Visage for the next 24 hours. The aging effect can be reversed with a ““ spell, but only within 24 hours of it occurring.

Possession (Recharge 6). One humanoid that the ghost can see within 5 feet of it must succeed on a DC 13 Charisma saving throw or be possessed by the ghost; the ghost then disappears, and the target is incapacitated and loses control of its body. The ghost now controls the body but doesn’t deprive the target of awareness. The ghost can’t be targeted by any attack, spell, or other effect, except ones that turn undead, and it retains its alignment, Intelligence, Wisdom, Charisma, and immunity to being charmed and frightened. It otherwise uses the possessed target’s statistics, but doesn’t gain access to the target’s knowledge, class features, or proficiencies. The possession lasts until the body drops to 0 hit points, the ghost ends it as a bonus action, or the ghost is turned or forced out by an effect like the ““ spell. When the possession ends, the ghost reappears in an unoccupied space within 5 feet of the body. The target is immune to this ghost’s Possession for 24 hours after succeeding on the saving throw or after the possession ends.

Tiny beast, unaligned

Armor Class 11
Hit Points 1 (1d4 - 1)
Speed 20 ft., swim 20 ft.

STR	DEX	CON	INT	WIS	CHA
1 (-5)	13 (+1)	8 (-1)	1 (-5)	8 (-1)	3 (-4)

Saving Throws
Skills Perception +1, Stealth +3
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 30 ft., passive Perception 11
Languages --
Challenge 0 (0 XP)

Amphibious. The frog can breathe air and water.

Standing Leap. The frog’s long jump is up to 10 feet and its high jump is up to 5 feet, with or without a running start. A frog has no effective attacks. It feeds on small insects and typically dwells near water, in trees, or underground. The frog’s statistics can also be used to represent a toad.

Medium monstrosity, neutral evil

Armor Class 13 (natural armor)
Hit Points 44 (8d8 + 8)
Speed 30 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
14 (+2)	15 (+2)	13 (+1)	7 (-2)	12 (+1)	8 (-1)

Saving Throws 
Skills Perception +3, Stealth +4, Survival +3
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses darkvision 60 ft., passive Perception 13
Languages --
Challenge 2 (450 XP)

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

Web Sense. While in contact with a web, the ettercap knows the exact location of any other creature in contact with the same web.

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

Actions

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

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 6 (1d8 + 2) piercing damage plus 4 (1d8) poison damage. The target must succeed on a DC 11 Constitution saving throw or be poisoned for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

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

Web (Recharge 5–6). Ranged Weapon Attack: +4 to hit, range 30/60 ft., one Large or smaller creature. Hit: The creature is restrained by webbing. As an action, the restrained creature can make a DC 11 Strength check, escaping from the webbing on a success. The effect also ends if the webbing is destroyed. The webbing has AC 10, 5 hit points, vulnerability to fire damage, and immunity to bludgeoning, poison, and psychic damage.

Medium humanoid (elf), neutral evil

Armor Class 15 (chain shirt)
Hit Points 13 (3d8)
Speed 30 ft.

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

Saving Throws
Skills Perception +2, Stealth +4
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 120 ft., passive Perception 12
Languages Elvish, Undercommon
Challenge 44930 (50 XP)

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

Innate Spellcasting. The drow’s spellcasting ability is Charisma (spell save DC 11). It can innately cast the following spells, requiring no material components: At will: ““ 1/day each: ““, ““

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

Actions

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

Hand Crossbow. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 5 (1d6 + 2) piercing damage, and the target must succeed on a DC 13 Constitution saving throw or be poisoned for 1 hour. If the saving throw fails by 5 or more, the target is also unconscious while poisoned in this way. The target wakes up if it takes damage or if another creature takes an action to shake it awake.

Huge beast, unaligned

Armor Class 12 (natural armor)
Hit Points 76 (8d12 + 24)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
22 (+6)	9 (-1)	17 (+3)	3 (-4)	11 (+0)	6 (-2)

Saving Throws
Skills
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 10
Languages --
Challenge 4 (1100 XP)

Trampling Charge. If the elephant moves at least 20 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 12 Strength saving throw or be knocked prone. If the target is prone, the elephant can make one stomp attack against it as a bonus action.

Actions

Gore. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) piercing damage.

Stomp. Melee Weapon Attack: +8 to hit, reach 5 ft., one prone creature. Hit: 22 (3d10 + 6) bludgeoning damage.

Medium humanoid (dwarf), lawful evil

Armor Class 16 (scale mail, shield)
Hit Points 26 (4d8 + 8)
Speed 25 ft.

STR	DEX	CON	INT	WIS	CHA
14 (+2)	11 (+0)	14 (+2)	11 (+0)	10 (+0)	9 (-1)

Saving Throws
Skills
Damage Resistances poison
Damage Immunities
Condition Immunities
Senses darkvision 120 ft., passive Perception 10
Languages Dwarvish, Undercommon
Challenge 1 (200 XP)

Duergar Resilience. The duergar has advantage on saving throws against poison, spells, and illusions, as well as to resist being charmed or paralyzed.

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

Actions

Enlarge (Recharges after a Short or Long Rest). For 1 minute, the duergar magically increases in size, along with anything it is wearing or carrying. While enlarged, the duergar is Large, doubles its damage dice on Strength-based weapon attacks (included in the attacks), and makes Strength checks and Strength saving throws with advantage. If the duergar lacks the room to become Large, it attains the maximum size possible in the space available.

War Pick. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage, or 11 (2d8 + 2) piercing damage while enlarged.

Javelin. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 30/120 ft., one target. Hit: 5 (1d6 + 2) piercing damage, or 9 (2d6 + 2) piercing damage while enlarged.

Invisibility (Recharges after a Short or Long Rest). The duergar magically turns invisible until it attacks, casts a spell, or uses its Enlarge, or until its concentration is broken, up to 1 hour (as if concentrating on a spell). Any equipment the duergar wears or carries is invisible with it.

Medium fey, neutral

Armor Class 11 (16 with barkskin)
Hit Points 22 (5d8)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
10 (+0)	12 (+1)	11 (+0)	14 (+2)	15 (+2)	18 (+4)

Saving Throws
Skills Perception +4, Stealth +5
Damage Resistances
Damage Immunities
Condition Immunities
Senses darkvision 60 ft., passive Perception 14
Languages Elvish, Sylvan
Challenge 1 (200 XP)

Innate Spellcasting. The dryad’s innate spellcasting ability is Charisma (spell save DC 14). The dryad can innately cast the following spells, requiring no material components: At will: ““ 3/day each: ““, ““ 1/day each: ““, ““, ““

Magic Resistance. The dryad has advantage on saving throws against spells and other magical effects.

Speak with Beasts and Plants. The dryad can communicate with beasts and plants as if they shared a language.

Tree Stride. Once on her turn, the dryad can use 10 feet of her movement to step magically into one living tree within her reach and emerge from a second living tree within 60 feet of the first tree, appearing in an unoccupied space within 5 feet of the second tree. Both trees must be Large or bigger.

Actions

Club. Melee Weapon Attack: +2 to hit (+6 to hit with [yadawiki link=“shillelagh_), reach 5 ft., one target. Hit: 2 (1d4) bludgeoning damage, or 8 (1d8 + 4) bludgeoning damage with [yadawiki link=“shillelagh_.

Fey Charm. The dryad targets one humanoid or beast that she can see within 30 feet of her. If the target can see the dryad, it must succeed on a DC 14 Wisdom saving throw or be magically charmed. The charmed creature regards the dryad as a trusted friend to be heeded and protected. Although the target isn’t under the dryad’s control, it takes the dryad’s requests or actions in the most favorable way it can. Each time the dryad or its allies 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 dryad dies, is on a different plane of existence from the target, or ends the effect as a bonus action. If a target’s saving throw is successful, the target is immune to the dryad’s Fey Charm for the next 24 hours. The dryad can have no more than one humanoid and up to three beasts charmed at a time.

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.