Large monstrosity, lawful neutral

Armor Class 17 (natural armor)
Hit Points 199 (19d10 + 95)
Speed 40 ft., fly 60 ft.

STR	DEX	CON	INT	WIS	CHA
22 (+6)	10 (+0)	20 (+5)	16 (+3)	18 (+4)	23 (+6)

Saving Throws Dex +6, Con +11, Int +9, Wis +10
Skills Arcana +9, Perception +10, Religion +15
Damage Resistances 
Damage Immunities psychic; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, frightened
Senses truesight 120 ft., passive Perception 20
Languages Common, Sphinx
Challenge 17 (18000 XP)

Inscrutable. The sphinx is immune to any effect that would sense its emotions or read its thoughts, as well as any divination spell that it refuses. Wisdom (Insight) checks made to ascertain the sphinx’s intentions or sincerity have disadvantage.

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

Spellcasting. The sphinx is a 12th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 18, +10 to hit with spell attacks). It requires no material components to cast its spells. The sphinx has the following cleric spells prepared: Cantrips (at will): ““, ““, ““ 1st level (4 slots): ““, ““, ““ 2nd level (3 slots): ““, ““ 3rd level (3 slots): ““, ““ 4th level (3 slots): ““, ““ 5th level (2 slots): ““, ““ 6th level (1 slot): ““

Actions

Multiattack. The sphinx makes two claw attacks.

Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) slashing damage.

Roar (3/Day). The sphinx emits a magical roar. Each time it roars before finishing a long rest, the roar is louder and the effect is different, as detailed below. Each creature within 500 feet of the sphinx and able to hear the roar must make a saving throw.

First Roar. Each creature that fails a DC 18 Wisdom saving throw is frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Second Roar. Each creature that fails a DC 18 Wisdom saving throw is deafened and frightened for 1 minute. A frightened creature is paralyzed and can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Third Roar. Each creature makes a DC 18 Constitution saving throw. On a failed save, a creature takes 44 (8d10) thunder damage and is knocked prone. On a successful save, the creature takes half as much damage and isn’t knocked prone.

Legendary Actions

The sphinx 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 sphinx regains spent legendary actions at the start of its turn.

Claw Attack. The sphinx makes one claw attack.

Teleport (Costs 2 Actions). The sphinx magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.

Cast a Spell (Costs 3 Actions). The sphinx casts a spell from its list of prepared spells, using a spell slot as normal.

Huge beast, unaligned

Armor Class 13 (natural armor)
Hit Points 136 (13d12 + 52)
Speed 50 ft.

STR	DEX	CON	INT	WIS	CHA
25 (+7)	10 (+0)	19 (+4)	2 (-4)	12 (+1)	9 (-1)

Saving Throws
Skills Perception +4
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 14
Languages --
Challenge 8 (3900 XP)

Actions

Multiattack. The tyrannosaurus makes two attacks: one with its bite and one with its tail. It can’t make both attacks against the same target.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 33 (4d12 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the tyrannosaurus can’t bite another target.

Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage.

Medium undead, lawful evil

Armor Class 13 (armor scraps)
Hit Points 13 (2d8 + 4)
Speed 30 ft.

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

Saving Throws 
Skills 
Damage Resistances 
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 44930 (50 XP)

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.

Large undead, lawful evil

Armor Class 13 (barding scraps)
Hit Points 22 (3d10 + 6)
Speed 60 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	12 (+1)	15 (+2)	2 (-4)	8 (-1)	5 (-3)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities poison
Condition Immunities exhaustion, poisoned
Senses darkvision 60 ft., passive Perception 9
Languages --
Challenge 44928 (100 XP)

Actions

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Large ooze, unaligned

Armor Class 7
Hit Points 85 (10d10 + 30)
Speed 20 ft., climb 20 ft.

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

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities acid, cold, lightning, slashing
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 4 (1100 XP)

Amorphous. The pudding can move through a space as narrow as 1 inch wide without squeezing.

Corrosive Form. A creature that touches the pudding or hits it with a melee attack while within 5 feet of it takes 4 (1d8) acid damage. Any nonmagical weapon made of metal or wood that hits the pudding corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition made of metal or wood that hits the pudding is destroyed after dealing damage. The pudding can eat through 2-inch-thick, nonmagical wood or metal in 1 round.

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

Actions

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 18 (4d8) acid damage. In addition, nonmagical armor worn by the target is partly dissolved and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Reactions

Split. When a pudding that is Medium or larger is subjected to lightning or slashing damage, it splits into two new puddings if it has at least 10 hit points. Each new pudding has hit points equal to half the original pudding’s, rounded down. New puddings are one size smaller than the original pudding.

Large ooze, unaligned

Armor Class 6
Hit Points 84 (8d10 + 40)
Speed 15 ft.

STR	DEX	CON	INT	WIS	CHA
14 (+2)	3 (-4)	20 (+5)	1 (-5)	6 (-2)	1 (-5)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities 
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Languages --
Challenge 2 (450 XP)

Ooze Cube. The cube takes up its entire space. Other creatures can enter the space, but a creature that does so is subjected to the cube’s Engulf and has disadvantage on the saving throw. Creatures inside the cube can be seen but have total cover. A creature within 5 feet of the cube can take an action to pull a creature or object out of the cube. Doing so requires a successful DC 12 Strength check, and the creature making the attempt takes 10 (3d6) acid damage. The cube can hold only one Large creature or up to four Medium or smaller creatures inside it at a time.

Transparent. Even when the cube is in plain sight, it takes a successful DC 15 Wisdom (Perception) check to spot a cube that has neither moved nor attacked. A creature that tries to enter the cube’s space while unaware of the cube is surprised by the cube.

Actions

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) acid damage.

Engulf. The cube moves up to its speed. While doing so, it can enter Large or smaller creatures’ spaces. Whenever the cube enters a creature’s space, the creature must make a DC 12 Dexterity saving throw. On a successful save, the creature can choose to be pushed 5 feet back or to the side of the cube. A creature that chooses not to be pushed suffers the consequences of a failed saving throw. On a failed save, the cube enters the creature’s space, and the creature takes 10 (3d6) acid damage and is engulfed. The engulfed creature can’t breathe, is restrained, and takes 21 (6d6) acid damage at the start of each of the cube’s turns. When the cube moves, the engulfed creature moves with it. An engulfed creature can try to escape by taking an action to make a DC 12 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the cube.

Large monstrosity, lawful neutral

Armor Class 17 (natural armor)
Hit Points 136 (16d10 + 48)
Speed 40 ft., fly 60 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	15 (+2)	16 (+3)	18 (+4)	18 (+4)	18 (+4)

Saving Throws 
Skills Arcana +12, History +12, Perception +8, Religion +8
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities psychic
Condition Immunities charmed, frightened
Senses truesight 120 ft., passive Perception 18
Languages Common, Sphinx
Challenge 11 (7200 XP)

Inscrutable. The sphinx is immune to any effect that would sense its emotions or read its thoughts, as well as any divination spell that it refuses. Wisdom (Insight) checks made to ascertain the sphinx’s intentions or sincerity have disadvantage.

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

Spellcasting. The sphinx is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 16, +8 to hit with spell attacks). It requires no material components to cast its spells. The sphinx has the following wizard spells prepared: Cantrips (at will): ““, ““, ““ 1st level (4 slots): ““, ““, ““ 2nd level (3 slots): ““, ““, ““ 3rd level (3 slots): ““, ““, ““ 4th level (3 slots): ““, ““ 5th level (1 slot): ““

Actions

Multiattack. The sphinx makes two claw attacks.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Legendary Actions

The sphinx 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 sphinx regains spent legendary actions at the start of its turn.

Claw Attack. The sphinx makes one claw attack.

Teleport (Costs 2 Actions). The sphinx magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.

Cast a Spell (Costs 3 Actions). The sphinx casts a spell from its list of prepared spells, using a spell slot as normal.

Large undead, lawful evil

Armor Class 12 (natural armor)
Hit Points 67 (9d10 + 18)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	11 (+0)	15 (+2)	6 (-2)	8 (-1)	5 (-3)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities poison
Condition Immunities exhaustion, poisoned
Senses darkvision 60 ft., passive Perception 9
Languages understands Abyssal but can't speak
Challenge 2 (450 XP)

Charge. If the skeleton moves at least 10 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 9 (2d8) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be pushed up to 10 feet away and knocked prone.

Actions

Greataxe. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) slashing damage.

Gore. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.

Medium swarm of Tiny beasts, unaligned

Armor Class 14
Hit Points 36 (8d8)
Speed 30 ft., swim 30 ft.

STR	DEX	CON	INT	WIS	CHA
8 (-1)	18 (+4)	11 (+0)	1 (-5)	10 (+0)	3 (-4)

Saving Throws 
Skills 
Damage Resistances bludgeoning, piercing, slashing
Damage Immunities 
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 10 ft., passive Perception 10
Languages --
Challenge 2 (450 XP)

Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny snake. The swarm can’t regain hit points or gain temporary hit points.

Actions

Bites. Melee Weapon Attack: +6 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer. The target must make a DC 10 Constitution saving throw, taking 14 (4d6) poison damage on a failed save, or half as much damage on a successful one.

Large monstrosity, chaotic evil

Armor Class 15 (natural armor)
Hit Points 75 (10d10 + 20)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	17 (+3)	14 (+2)	16 (+3)	15 (+2)	16 (+3)

Saving Throws Dex +6, Con +5, Wis +5, Cha +6
Skills 
Damage Resistances 
Damage Immunities poison
Condition Immunities charmed, poisoned
Senses darkvision 60 ft., passive Perception 12
Languages Abyssal, Common
Challenge 8 (3900 XP)

Rejuvenation. If it dies, the naga returns to life in 1d6 days and regains all its hit points. Only a ““ spell can prevent this trait from functioning.

Spellcasting. The naga is a 10th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks), and it needs only verbal components to cast its spells. It has the following wizard spells prepared: Cantrips (at will): ““, ““, ““ 1st level (4 slots): ““, ““, ““ 2nd level (3 slots): ““, ““ 3rd level (3 slots): ““, ““ 4th level (3 slots): ““, ““ 5th level (2 slots): ““

Actions

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 7 (1d6 + 4) piercing damage, and the target must make a DC 13 Constitution saving throw, taking 31 (7d8) poison damage on a failed save, or half as much damage on a successful one.