Random Monster Generator (5e Other)

Alignment (Law-Chaos Axis)

There is no mechanical difference per se between a monster that is "strongly" (alignment) and just (alignment), but the distinction is still useful as a roleplaying guide. For example, some monsters may be unambiguously more evil (or good, lawful, chaotic) than others.

d10	Alignment
1	Strongly Chaotic
2-3	Chaotic
4-7	Neutral
8-9	Lawful
10	Strongly Lawful

Alignment (Good-Evil Axis)

d10	Alignment
1	Strongly Evil
2-3	Evil
4-7	Neutral
8-9	Good
10	Strongly Good

Monster Type

Roll a d10; On a 1-9, roll once on the following table. On a 10, roll twice and combine the results; the monster is considered to be both types.

d20	Type
1-2	Aberration
3	Beast
4	Celestial
5-6	Construct
7	Dragon
8-9	Elemental
10	Fey
11-12	Fiend
13-14	Humanoid
15-16	Monstrosity
17	Ooze
18	Plant
19-20	Undead

Size

A creature's type changes from humanoid to giant if it is Large or larger.

d24	Size
1	Tiny ( less than 1')
2	Tiny (1' - 2')
3-4	Small (2' - 3')
5-6	Small (3' - 4')
7-9	Medium (4' - 6')
10-12	Medium (6' - 8')
13-15	Large (8' - 12')
16-18	Large (12' - 16')
19-20	Huge (16' - 24')
21-22	Huge (24' - 32')
23	Gargantuan (32' - 48')
24	Gargantuan (48' - 64')

Strength based on size

To determine a creature's Strength score, cross-reference its size with the result of a die roll. On the chart, DR is shorthand for "drop the lowest".

Strength based on size

d20	Result	Tiny	Small	Medium	Large	Huge	Gargantuan
1-2	Very weak	1	1d4	2d4	2d6	3d6	4d6DR
3-4	Weak	1d4	2d4	2d6	3d6	4d6DR	2d6 + 8
5-7	Below Average	2d4	2d6	3d6	4d6DR	2d6 + 8	3d6 + 8
8-13	Average	2d6	3d6	4d6DR	2d6+8	3d6+8	2d6+15
14-16	High Average	3d6	4d6DR	2d6+8	3d6+8	2d6+15	1d6 + 24
17-18	Strong	4d6DR	2d6+8	3d6+8	2d6 + 15	1d6 + 24	1d4 + 26
19-20	Very Strong	2d6+8	3d6 + 8	2d6 + 15	1d6 + 24	1d4 + 26	30

Dexterity

Monsters' Dexterity scores seem to be conservative in 5e, and not vary as much as Strength or Constitution scores. Size doesn't seem to have much of an effect on Dexterity; even for huge creatures which should be clumsy and ungainly, anything lower than a 9 is rare.

Add 2 to the monster's Dexterity score if it is Small or add 4 to the monster's Dexterity score if it is Tiny.

d20	Result	Dexterity score
1-2	Very Clumsy	2d6
3-4	Clumsy	3d6 - 2
5-7	Below Average	3d6
8-13	Average	4d6DR
14-16	Above Average	2d6 + 8
17-18	Agile	2d6 + 10
19-20	Very Agile	2d6 + 12

Constitution based on size

Constitution generally seems to be correlated with Strength, with the exception that even tiny, physically weak creatures rarely have a negative Constitution modifier. Thus, Constitution scores "bottom out" at a higher level than Strength does.

To determine a creature's Constitution score, cross-reference its size with the result of a die roll. On the chart, DR is shorthand for "drop the lowest".

Strength based on size

d20	Result	Tiny	Small	Medium	Large	Huge	Gargantuan
1-2	Very Frail	3d6 - 4	3d6 - 4	3d6 - 4	3d6 - 2	4d6DR	4d6DR
3-4	Frail	3d6 - 2	3d6 - 2	3d6 - 2	3d6 - 2	4d6DR	2d6 + 8
5-7	Below Average	3d6 - 2	3d6	3d6	4d6DR	2d6 + 8	3d6 + 8
8-13	Average	3d6	4d6DR	4d6DR	2d6+8	3d6+8	2d6+15
14-16	Above Average	4d6DR	4d6DR	2d6+8	3d6+8	2d6+15	1d6 + 24
17-18	Hearty	4d6DR + 2	4d6DR + 2	2d6 + 10	2d6 + 15	1d6 + 24	1d4 + 26
19-20	Very Hearty	4d6DR + 4	4d6DR + 4	2d6 + 12	1d6 + 24	1d4 + 26	30

Mental Ability Scores (Intelligence, Wisdom, and Charisma)

To determine a creature's mental ability scores, roll on the following table.

Mental Ability Scores

d100	Result	Score
1-5	Nonsentient	Intelligence 1, Wisdom 3d6, Charisma 1
6-10	Animal Intelligence	Intelligence 1d4, Wisdom 3d6, Charisma 2d6
11-15	Very Low Mentality	Intelligence 2d4, Wisdom 2d4, Charisma 2d4
16-25	Low Mentality	Intelligence 2d6, Wisdom 2d6, Charisma 2d6
26-35	Below Average	Intelligence 3d6, Wisdom 3d6, Charisma 3d6
36-65	Average	Intelligence 4d6DR, Wisdom 4d6DR, Charisma 4d6DR
66-85	Above Average Mentality	Intelligence 2d6 + 8, Wisdom 2d6 + 8, Charisma 2d6 + 8
86-95	Genius Mentality	Intelligence 3d6 + 8, Wisdom 3d6 + 8, Charisma 3d6 + 8
96-99	Super-Genius Mentality	Intelligence 2d6 + 15, Wisdom 2d6 + 15, Charisma 2d6 + 15
100	Godlike Mentality	Intelligence 1d6 + 24, Wisdom 1d6 + 24, Charisma 1d6 + 24

Hit Dice based on size

Generally, it seems like larger monsters have more hit dice.

Hit Points per Hit Die: 1d4 for Tiny monsters, 1d6 for Small monsters, 1d8 for Medium monsters, 1d10 for Large monsters, 1d12 for Huge monsters, and 1d20 for Gargantuan monsters.

Hit Dice based on size

d20	Tiny Hit Dice	Small Hit Dice	Medium Hit Dice	Large Hit Dice	Huge Hit Dice	Gargantuan Hit Dice
1-2	1	1	1	2	6	10
3-4	1	1	1	3	7	11
5-6	1	1	1	4	8	12
7-8	1	1	2	5	9	13
9-10	1	2	3	6	10	14
11-12	2	3	4	7	11	15
13-14	3	4	5	8	12	16
15	4	5	6	9	13	17
16	5	6	7	10	14	18
17	6	7	8	11	15	19
18	7	8	9	12	16	20
19	8 + 1d10	9 + 1d10	10 + 1d10	12 + 1d10	16 + 1d10	20 + 1d10
20	18 + 1d10	19 + 1d10	20 + 1d10	22 + 1d10	26 + 1d10	30 + 1d10

Movement

A creature's Basic Movement Rate (BMR) is as follows:

• Tiny: 10 feet
• Small: 20 feet
• Medium: 30 feet
• Large: 40 feet
• Huge: 50 feet
• Gargantuan: 60 feet

Be creative! Especially for such exotica as constructs, "limbs" do not have to necessarily be legs; they could be treads or wheels. A creature that is solely aquatic or only a flier might not even have legs.

d20	The creature primarily moves...	Primary Speed
1-6	On land using two limbs (bipedal)*	Walk BMR
7-12	On land using more than two limbs (multipedal)	Walk BMR (special)
13-14	On land by creeping, slithering, bouncing, or rolling with its body or tail	Walk BMR
15-17	Through water by swimming	Swim BMR
18-20	Through the air by flying	Fly BMR

*Pure humanoids are automatically bipedal; no rolling is neccessary.

Next, roll on the following chart to determine the monster's modified primary speed:

d10	Description | Modifier
1	Sluggish | Primary speed = BMR - (1d6x5) feet, minimum 5 feet
2-3	Slow | Primary speed = BMR - (1d4x5) feet, minimum 5 feet
4-7	Average | Primary Speed = BMR + (1d3-1d3)x5 feet, minimum 5 feet
8	Fast | Primary Speed = BMR + 1d4x5 feet
9	Very Fast | Primary Speed = BMR + 1d6x5 feet
10	Speed Demon! | Primary Speed = BMR + 2d6x5 feet

If a monster's primary movement is not walking, there is a 50% chance (4-6 on a d6) that the monster can walk as a form of secondary movement. If that is the case, roll 1d6. The monster can walk at (1-3) ¹/₃ or (4-6) 0.5 ½ it's primary speed.

After following the previous step, if necessary, roll 1d6. On a 5-6, the creature has one or more forms of secondary movement. Roll on the following table to determine the creature's alternative mode(s) of movement.

d12	Secondary Movement
1	The monster can walk at a speed equal to its primary speed.
2	The monster has a jumping speed equal to its primary speed.
3	The monster has a climbing speed equal to its primary speed.
4	The monster has a swimming speed equal to its primary speed.
5	The monster has a climbing speed equal to its primary speed. It can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
6	The monster does not expend additional movement across one or more forms of difficult terrain.
7	Roll 1d6. The monster has a burrowing speed equal to (1-2) 1/3, (3-4) 0.5 ½, or (5-6)} its full primary speed.
8	Roll 1d6. The monster has a burrowing speed equal to (1-2) 1/3, (3-4) 0.5 ½, or (5-6)} its full primary speed. It can tunnel through rock and stone in addition to softer materials such as dirt.
9	The monster has a Glide Speed equal to its primary speed.
10	Roll 1d6. The monster has a flying speed equal to (1-2) half its primary speed, (3-4) its primary speed, or (5-6) twice its primary speed.
11	The monster 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.
12	Roll twice more, rerolling duplicate or redundant results.

After resolving all other calculations, a multipedal creature's land speed is multiplied by 10.5 ½, as its bodily form is optimized for rapidly crossing terrain.

Natural Weaponry

Bipedal creatures have a 50% chance (1-3 on 1d6) of having no natural weapons, relying on unarmed strikes or manufactured weapons.

d12	Primary Natural Weapon (Damage Type)
1-3	Bite (Piercing)
4-5	Claw (Slashing)
6-7	Slam (Bludgeoning)
8	Gore (Piercing)
9	Tail (Bludgeoning)
10	Sting (Piercing)
11	Tentacle (Bludgeoning)
12	Pincer (Bludgeoning)

After determining a creature's primary natural weapon (if any), roll 1d10. On a 1-4, the creature has no secondary natural weapons. On a 5-7, it has one secondary natural weapon. On a 8-9, it has three secondary attacks. On a 10, it has four.

d12	Secondary Natural Weapon (Damage Type)
1-2	Bite (Piercing)
3-4	Claw (Slashing)
5-6	Slam (Bludgeoning)
7	Gore (Piercing)
8	Tail (Bludgeoning)
9	Sting (Piercing)
10	Tentacle (Bludgeoning)
11	Pincer (Bludgeoning)
12	Wing (Bludgeoning)

Primary Natural Weapon Damage Based on Size

d20	Tiny	Small	Medium	Large	Huge	Gargantuan
1-5	1	1	1d4	2d4	3d4	4d4
6-10	1	1d4	1d6	2d6	3d6	4d6
11-12	1d4	1d6	1d8	2d8	3d8	4d8
13-14	1d6	1d8	2d4	4d4	6d4	8d4
15	1d8	2d4	1d10	2d10	3d10	4d10
16	2d4	1d10	1d12	2d12	3d12	4d12
17	1d10	1d12	2d6	4d6	6d6	8d6
18	1d12	2d6	2d8	4d8	6d8	8d8
19	2d6	2d8	3d6	6d6	9d6	12d6
20	2d8	3d6	2d10	4d10	6d10	8d10

The damage of a monster's secondary natural weapon(s) are relative to the damage of a monster's primary natural weapons.

d6	Secondary Natural Weapon Damage
1-3	Half the damage of a primary natural weapon
4-5	Two steps smaller (2d6 -> 1d10 -> 1d6, etc.)
6	One step smaller (2d6 -> 1d12 -> 1d10, etc.)

Natural Armor

d20	Natural Armor Grade	AC
1-5	0	10 + Dexterity modifier
6-7	1	11 + Dexterity modifier
8-9	2	12 + Dexterity modifier
10-11	3	13 + Dexterity modifier
12	4	14 + Dexterity modifier
13	5	15 + Dexterity modifier
14-15	1A	11 + Dexterity modifier + Constitution modifier
16-17	2A	12 + Dexterity modifier + Constitution modifier
18	3A	13 + Dexterity modifier + Constitution modifier
19	4A	14 + Dexterity modifier + Constitution modifier
20	5A	15 + Dexterity modifier + Constitution modifier

Senses

d20	Senses
1-5	Nothing Special
6-10	Darkvision (range 1d4x30 feet); 1 in 4 chance (4 on 1d4) that magical darkness doesn't impede the monster's darkvision.
11-12	Blindsight (range 1d4x15 feet)
13-14	Blindsight (range 1d4x30 feet); 1 in 4 chance (4 on 1d4) that the monster is blind beyond this radius.
14	Truesight (range 1d4x30 feet)
15	The monster has all-around vision; it can see in a 360-degree radius around it.
16	The monster can see through one or more obscuring factors other than darkness (e.g. fog, sand, or smoke) as if the monster's vision wasn't obscured.
17	The monster can see into and through solid matter (x-ray vision) to a range of 1d4x30 feet. Its vision can penetrate 1 foot of stone, 1 inch of common metal, or up to 3 feet of wood or dirt. Thicker substances block the vision, as does a thin sheet of lead.
18	The monster can continuously detect evil and good.
19	The monster knows if it hears a lie.
20	Roll twice more on this chart.

Saving Throw DC

Add +1 to the DC if the monster has 5 or more hit dice, add +2 to the DC if the monster has 11 or more hit dice, or add +3 to the DC if the monster has 17 or more hit dice.

d12	Saving Throw DC	Alternative DC
1-2	12	10
3-4	13	11
5-6	14	12
7	15	12
8	16	13
9	17	14
10	18	15
11	19	16
12	20	17

Damage Type

Roll on this table when a random damage type is called for.

d12	Damage Type
1	Acid
2	Cold
3	Fire
4	Force
5	Lightning
6	Necrotic
7	Poison
8	Psychic
9	Radiant
10	Thunder
11	Water
12	Wind

Special Abilities

d12	Special Attack	Summary
1-2	Damaging Aura	At the start of each of the monster's turns, each creature within 5 feet of it takes 10 (3d6) damage. A creature that touches the monster or hits it with a melee attack while within 5 feet of it takes 10 (3d6) damage.
3-4	Breath Weapon	As an action, the monster exhales elemental energy in either a cone or line, size depending on the size of the creature. Fire, acid, lightning, and force require Dexterity saving throws. Cold, poison, radiant, necrotic, and thunder require Constitution saving throws. Psychic requires Intelligence saving throws. The damage dealt is dependent on size: Tiny (2d6), Small (4d6), Medium (7d6), Large (16d6), Huge (18d6), and Gargantuan (26d6)
5-6	Elemental Weapons	The monsters weapon attacks, be they natural or weapons, deal an additional 2d6 elemental damage.
7-8	Innate Spellcasting	The monster can innately cast spells, using either Inteligence, Wisdom, or Charisma for DCs and spell attack rolls. The monster has 1d4 spells it can cast at will, 1d4 spells it can cast 3 times per day each, and 1d2 spells it can cast once per day. You decide which spells, or use a random spell table.
9-10	Frightening Presence	As an action, the monster can attempt to frighten as many targets it can see within 30 feet of it (60 feet if Huge or larger). The targets must succeed on a Wisdom saving throw (DC = Monsters Charisma bonus + 8 + proficiency bonus), or be frightened of the monster for 1 minute. A target that succeeds on this saving throw is immune to the monster's frightening presence for 24 hours.
11	Charm	The monster attempts to charm one target it can see within 60 feet of it. The target must succeed on a Wisdom saving throw (DC = Monster's Charisma bonus + 8 + proficiency bonus) or be charmed by the monster for 1 minute. The target can attempt the saving throw again at the end of each of its turns. Once a target has succeeded on the saving throw, they are immune to the monster's charm for 24 hours.
12	Healing Touch	The monster touches a creature, healing them for 18 (4d8) hit points.

Special Qualities

d12	Special Quality	Summary
1-2	Magic Resistance	The monster has advantage on saving throws against spells and other magical effects.
3-4	Amphibious	The monster can breath air and water.
5-6	Camouflage	The monster has advantage on Dexterity (Stealth) checks to hide in its home environment.
7	Damage Absorbtion	When the monster is subjected to an elemental damage type, it takes no damage and instead regains a number of hit points equal to the elemental damage taken.
8	Illumination	The monster emits a radius of bright light, and dim light beyond that.
9	Keen Senses	The monster has advantage on Wisdom (Perception) checks made with two of its senses.
10	Pack Tactics	The monster has advantage on attacks rolls against a target if an ally of the monster is adjacent to the target and is not incapacitated.
11	Regeneration	The monster regains a number of hit points at the start of its turn, as long as it has 1 hit point remaining.
12	Shapechanger	The monster can use an action to transform into something.

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