Medium undead, any evil alignment

Armor Class 17 (natural armor)
Hit Points 135 (18d8 + 54)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
11 (+0)	16 (+3)	16 (+3)	20 (+5)	14 (+2)	16 (+3)

Saving Throws Con +10, Int +12, Wis +9
Skills Arcana +18, History +12, Insight +9, Perception +9
Damage Resistances cold, lightning, necrotic
Damage Immunities poison; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, exhaustion, frightened, paralyzed, poisoned
Senses truesight 120 ft., passive Perception 19
Languages Common plus up to five other languages
Challenge 21 (33000 XP)

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

Rejuvenation. If it has a phylactery, a destroyed lich gains a new body in 1d10 days, regaining all its hit points and becoming active again. The new body appears within 5 feet of the phylactery.

Spellcasting. The lich is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). The lich 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 (3 slots): ““, ““ 6th level (1 slot): ““, ““ 7th level (1 slot): ““, ““ 8th level (1 slot): ““, ““ 9th level (1 slot): ““

Turn Resistance. The lich has advantage on saving throws against any effect that turns undead.

Actions

Paralyzing Touch. Melee Spell Attack: +12 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage. The target must succeed on a DC 18 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Legendary Actions

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

Cantrip. The lich casts a cantrip.

Paralyzing Touch (Costs 2 Actions). The lich uses its Paralyzing Touch.

Frightening Gaze (Costs 2 Actions). The lich fixes its gaze on one creature it can see within 10 feet of it. The target must succeed on a DC 18 Wisdom saving throw against this magic or become frightened for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target’s saving throw is successful or the effect ends for it, the target is immune to the lich’s gaze for the next 24 hours.

Disrupt Life (Costs 3 Actions). Each living creature within 20 feet of the lich must make a DC 18 Constitution saving throw against this magic, taking 21 (6d6) necrotic damage on a failed save, or half as much damage on a successful one.

Tiny beast, unaligned

Armor Class 10
Hit Points 2 (1d4)
Speed 20 ft., climb 20 ft.

STR	DEX	CON	INT	WIS	CHA
2 (-4)	11 (+0)	10 (+0)	1 (-5)	8 (-1)	3 (-4)

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

Actions

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

Large beast, unaligned

Armor Class 12
Hit Points 26 (4d10 + 4)
Speed 50 ft.

STR	DEX	CON	INT	WIS	CHA
17 (+3)	15 (+2)	13 (+1)	3 (-4)	12 (+1)	8 (-1)

Saving Throws
Skills Perception +3, Stealth +6
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 13
Languages --
Challenge 1 (200 XP)

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

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

Pounce. If the lion moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is prone, the lion can make one bite attack against it as a bonus action.

Running Leap. With a 10-foot running start, the lion can long jump up to 25 feet.

Actions

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

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

Large monstrosity, chaotic evil

Armor Class 13 (natural armor)
Hit Points 97 (13d10 + 26)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
16 (+3)	13 (+1)	15 (+2)	14 (+2)	15 (+2)	16 (+3)

Saving Throws 
Skills Deception +7, Insight +4, Stealth +3
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses darkvision 60 ft., passive Perception 12
Languages Abyssal, Common
Challenge 4 (1100 XP)

Innate Spellcasting. The lamia’s innate spellcasting ability is Charisma (spell save DC 13). It can innately cast the following spells, requiring no material components. At will: ““ (any humanoid form), ““ 3/day each: ““, ““, ““, ““ 1/day: ““

Actions

Multiattack. The lamia makes two attacks: one with its claws and one with its dagger or Intoxicating Touch.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 14 (2d10 + 3) slashing damage.

Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.

Intoxicating Touch. Melee Spell Attack: +5 to hit, reach 5 ft., one creature. Hit: The target is magically cursed for 1 hour. Until the curse ends, the target has disadvantage on Wisdom saving throws and all ability checks.

Medium humanoid (lizardfolk), neutral

Armor Class 15 (natural armor, shield)
Hit Points 22 (4d8 + 4)
Speed 30 ft., swim 30 ft.

STR	DEX	CON	INT	WIS	CHA
15 (+2)	10 (+0)	13 (+1)	7 (-2)	12 (+1)	7 (-2)

Saving Throws
Skills Perception +3, Stealth +4, Survival +5
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 13
Languages Draconic
Challenge 44928 (100 XP)

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

Actions

Multiattack. The lizardfolk makes two melee attacks, each one with a different weapon.

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

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

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.

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

Huge beast, unaligned

Armor Class 13 (natural armor)
Hit Points 126 (11d12 + 55)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
24 (+7)	9 (-1)	21 (+5)	3 (-4)	11 (+0)	6 (-2)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses passive Perception 10
Languages --
Challenge 6 (2300 XP)

Trampling Charge. If the mammoth 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 18 Strength saving throw or be knocked prone. If the target is prone, the mammoth can make one stomp attack against it as a bonus action.

Actions

Gore. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 25 (4d8 + 7) piercing damage.

Stomp. Melee Weapon Attack: +10 to hit, reach 5 ft., one prone creature. Hit: 29 (4d10 + 7) bludgeoning damage. A mammoth is an elephantine creature with thick fur and long tusks. Stockier and fiercer than normal elephants, mammoths inhabit a wide range of climes, from subarctic to subtropical.

Small elemental, chaotic neutral

Armor Class 14 (natural armor)
Hit Points 9 (2d6 + 2)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
7 (-2)	15 (+2)	12 (+1)	8 (-1)	11 (+0)	10 (+0)

Saving Throws
Skills
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities fire
Condition Immunities
Senses darkvision 60 ft., passive Perception 10
Languages Ignan
Challenge 44928 (100 XP)

Death Burst. When the magmin dies, it explodes in a burst of fire and magma. Each creature within 10 feet of it must make a DC 11 Dexterity saving throw, taking 7 (2d6) fire damage on a failed save, or half as much damage on a successful one. Flammable objects that aren’t being worn or carried in that area are ignited.

Ignited Illumination. As a bonus action, the magmin can set itself ablaze or extinguish its flames. While ablaze, the magmin sheds bright light in a 10-foot radius and dim light for an additional 10 feet.

Actions

Touch. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d6) fire damage. If the target is a creature or a flammable object, it ignites. Until a creature takes an action to douse the fire, the target takes 3 (1d6) fire damage at the end of each of its turns.

Medium humanoid (any race), any alignment

Armor Class 12 (15 with mage armor)
Hit Points 40 (9d8)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
9 (-1)	14 (+2)	11 (+0)	17 (+3)	12 (+1)	11 (+0)

Saving Throws Int +6, Wis +4
Skills Arcana +6, History +6
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses passive Perception 11
Languages any four languages
Challenge 6 (2300 XP)

Spellcasting. The mage is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The mage 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

Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 1) piercing damage. Mages spend their lives in the study and practice of magic. Good-aligned mages offer counsel to nobles and others in power, while evil mages dwell in isolated sites to perform unspeakable experiments without interference.

Large monstrosity, lawful evil

Armor Class 14 (natural armor)
Hit Points 68 (8d10 + 24)
Speed 30 ft., fly 50 ft.

STR	DEX	CON	INT	WIS	CHA
17 (+3)	16 (+3)	17 (+3)	7 (-2)	12 (+1)	8 (-1)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities 
Condition Immunities 
Senses darkvision 60 ft., passive Perception 11
Languages Common
Challenge 3 (700 XP)

Tail Spike Regrowth. The manticore has twenty-four tail spikes. Used spikes regrow when the manticore finishes a long rest.

Actions

Multiattack. The manticore makes three attacks: one with its bite and two with its claws or three with its tail spikes.

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

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

Tail Spike. Ranged Weapon Attack: +5 to hit, range 100/200 ft., one target. Hit: 7 (1d8 + 3) piercing damage.

Medium beast, unaligned

Armor Class 12
Hit Points 5 (1d8 + 1)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
13 (+1)	14 (+2)	12 (+1)	3 (-4)	12 (+1)	7 (-2)

Saving Throws
Skills Perception +3
Damage Resistances
Damage Immunities
Condition Immunities
Senses passive Perception 13
Languages --
Challenge 44934 (25 XP)

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

Actions

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) piercing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone. Mastiffs are impressive hounds prized by humanoids for their loyalty and keen senses. Mastiffs can be trained as guard dogs, hunting dogs, and war dogs. Halflings and other Small humanoids ride them as mounts.