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Size. This is the size of the creature. A creature's size is important, as it decides hit dice (which will be discussed later on), and also describes how much area the creature occupies if used in tabletop tactical combat. This should be capitalised. If your creature is a swarm, this is the size of the whole swarm, not the size of the individual creatures that compose it.
Swarm. If your creature is a swarm of lesser creatures, it should have the swarm feature, and the size of the creatures in the swarm should be listed here, not the size of the swarm itself. Most swarms are Medium and composed of Tiny creatures.
Type. This is the creature's type. A creature can have only one type. This shouldn't be capitalised.
Race. If your creature belongs to a race (e.g. human, elf, devil), it should be listed here. Most NPCs can be of any race, represented by 'any race', not 'any'.
Alignment. This is the creature's alignment. It should be listed in full (i.e. neutral (not true neutral, which is a 3.Xism), lawful good, not N or LG) and shouldn't be capitalised.

Armor Class This is the AC of your creature. (If your creature wears armor or uses a shield, list so here. Natural armor should be called 'natural armor' and not 'natural'. The base AC granted by a creature's Dexterity modifier isn't natural armor.)
Hit Points (This is an integral part of creature creation! Hit dice determine how many hit points a creature has, and are determined by size. A Tiny creature has d4 hit dice, a Small creature has d6 hit dice, a Medium creature has d8 hit dice, a Large creature has d10 hit dice, a Huge creature has d12 hit dice, and a Gargantuan creature has d20 hit dice. A general rule for hit point calculation is HD + (HD multiplied by Constitution modifier) = the creature's hit points.)
Speed This is the creature's speed. Most creatures have a main speed of around 30 feet (as far as most PCs can move in a turn), though some (like horses) move faster. If a creature has special movement modes, such as flight, include these here. If a creature with a flying speed can hover, list it here as well in parentheses. Speeds should be listed alphabetically, with its land-based movement (if any) listed first, for example, 30 ft., fly 30 ft. (hover), swim 20 ft. A creature without a land speed has its land speed listed as 0 ft., for example, 0 ft., swim 60 ft.
Ability Scores. These are your creature's ability scores. Ability scores in 5e can be no lower than 1 and no higher than 30.

Damage Vulnerabilities These are the creature's damage vulnerabilities. A creature vulnerable to a certain type of damage takes double the damage when subjected to that type of damage. Creatures are rarely vulnerable to more than one type of damage. Certain vulnerabilities have more impact on a creature than others. For example, a creature vulnerable to force damage would likely only have that weakness come into play if it were attacked by a magic missile spamming wizard, while a creature vulnerable to slashing damage would likely be torn apart very quickly by the barbarian with a greataxe. If a creature doesn't have any damage vulnerabilities, leave this space unchanged or blank.
Damage Resistances These are a creature's damage resistances. A creature resistant to a certain type of damage takes half the damage when subjected to that type of damage. Commonly resisted damage types include cold and fire. Another type of common resistance is bludgeoning, piercing, and slashing damage from nonmagical attacks, occasionally including a caveat to bypass their resistance, such as if the attack is silvered. If the creature has more resistances like that, it is written like this: cold; bludgeoning, piercing, and slashing from nonmagical attacks. If a creature doesn't have any damage resistances, leave this space unchanged or blank.
Damage Immunities These are a creature's damage immunities. A creature immune to a certain type of damage takes no damage when subjected to that type of damage. For example, most undead and fiends are immune to poison damage. If a creature doesn't have any damage immunities, leave this space unchanged or blank.
Condition Immunities These are a creature's condition immunities. A creature immune to a certain type of condition cannot be afflicted with that condition. Most undead and fiends are immune to the poisoned condition, for example, while a creature that permanently hovers (such as a ghost) would be immune to the prone condition. If a creature doesn't have any condition immunities, leave this space unchanged or blank. Conditions should always be linked using Template:5c.
Senses Passive Perception X (Put the creature's passive Wisdom (Perception) score (10 + the creature's Wisdom (Perception) modifier) and any special modes of sight here. Many creatures have darkvision, which is identical to that of a dwarf or elf, but some have other senses, like blindsight or truesight. Special senses should be listed alphabetically (blindsight, then darkvision, then tremorsense, then truesight), and go before the passive Perception score. If a creature has blindsight but can't see otherwise, it should be listed as such in parentheses. Senses have no impact on CR, but some stymie or render certain effects useless, such as blindsight and the blur spell).
Languages List the languages the creature can speak or understand here. Languages spoken have no impact on a creature's CR, but a creature that speaks many languages will have an advantage in social interaction, mainly because it might speak languages that it or its followers can understand, but that the PCs might not. If a creature speaks no languages, represent it with a dash (—). A creature with telepathy should have its ability listed here with a range in feet. If its telepathy is limited in some way, it should be represented with the Limited Telepathy feature. Having a language restriction on telepathy isn't cause for it to have limited telepathy.

Special traits and features that the monster shows are listed here. Common traits include Spellcasting, Innate Spellcasting, and Keen Senses.
Traits should have distinct effects. When creating a trait, consider if it would be better as part of the description. For example, if a trait mentions that that other creatures mindlessly obey your creature, you should list that in the description, not as a trait, but if it used magic to do so, consider granting it the Spellcasting or Innate Spellcasting feature and the ability to cast one or more enchantment spells.

Feature Name. Feature description

Spellcasting. If a creature has the Spellcasting or Innate Spellcasting feature (or both), it can cast spells. Spell names shouldn't be capitalised but should be in italics. Try and insert a link for convenience (if the spell is homebrew or in the SRD).

Swarm. If your creature is a swarm, it should have the following trait.
The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a (size of creatures in swarm) (creature). The swarm can't regain hit points or gain temporary hit points.

ACTIONS

Action Name.Melee Weapon Attack: +X to hit, reach 5 ft., one creature. Hit: X (1dX + X) damtype damage.

REACTIONS

If the creature can use its reaction for something special (standard uses for reactions — like the opportunity attack (not attack of opportunity, which is a 3.5ism) — don't need to be listed here. It is assumed the creature can do those anyway), list them here. A common example is Parry.

Parry. The X adds its proficiency modifier to its AC against one melee attack that would hit it. To do so, the X must see the attacker and be wielding a melee weapon.

LEGENDARY ACTIONS

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

Description. This is the description of the creature. Important things to consider include what the creature looks/sounds/smells/feels/tastes (if applicable) like, some typical behaviors, some lore or culture (if applicable, a race of forest-dwelling fey would obviously have more culture than a type of construct, for example) and some battle tactics that the usual specimen might follow (such as if it prefers to charge into the melee or whether it prefers to cast spells from a distance). Does it keep other creatures as mounts or companions? Does it usually form groups, or is it solitary? What is its preferred diet (if it does eat)? What is its usual habitat (temperate forests, deserts etc.)? What does the creature make/wear? What is it known for doing?