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Compendium
- Sources->Dungeons & Dragons->Dungeon Master’s Guide (2014)
Chapter 8: Running the Game Rules enable you and your players to have fun at the table. The rules serve you, not vice versa. There are the rules of the game, and there are table rules for how the
game is played. For instance, players need to know what happens when one of them misses a session. They need to know whether to bring miniatures, any special rules you’ve decided to use, and how to treat
Compendium
- Sources->Dungeons & Dragons->Tasha’s Cauldron of Everything
Ten Rules to Remember 1. The DM Adjudicates the Rules The rules of D&D cover many of the twists and turns that come up in play, but the possibilities are so vast that the rules can’t cover
everything. When you encounter something that the rules don’t cover or if you’re unsure how to interpret a rule, the DM decides how to proceed, aiming for a course that brings the most enjoyment to your whole
Compendium
- Sources->Dungeons & Dragons->Player's Handbook (2014)
examples of rule-breaking are more conspicuous. For instance, an adventurer can’t normally pass through walls, but some spells make that possible. Magic accounts for most of the major exceptions to the rules.
Specific Beats General This compendium contains rules that govern how the game plays. That said, many racial traits, class features, spells, magic items, monster abilities, and other game elements
Compendium
- Sources->Dungeons & Dragons->Sage Advice & Errata
Does all magical Darkness block Darkvision? Magical Darkness blocks Darkvision only if the rules text for a particular instance of Darkness says it does. For example, the Darkness spell specifies
that Darkvision can’t see through it. That obstruction is a feature of the spell, not a feature of magical Darkness in general.
Compendium
- Sources->Dungeons & Dragons->Sage Advice & Errata
Legendary Creatures (p. 11) This section has been tightened up to include the following new rules: The opening has a new second paragraph: “If a creature assumes the form of a legendary creature
them, and it can’t use them while incapacitated or otherwise unable to take actions. If surprised, it can’t use them until after its first turn in the combat.” The final sentence of the “Lair Actions
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
Languages This entry lists languages that the monster can use to communicate. Sometimes a monster can understand a language but can’t communicate with it, which is noted in its entry. “None
” indicates that a creature doesn’t comprehend any language. Telepathy Telepathy is a magical ability that allows a creature to communicate mentally with another creature within a specified range. See the “Rules Glossary” for more information.
Compendium
- Sources->Dungeons & Dragons->Strixhaven: A Curriculum of Chaos
Duels in the Repository Strixhaven students have the following rules for duels at the Furygale Repository: Only two students duel at a time. Duelists must use magic to defeat their opponents. Weapons
and magic items aren’t allowed. A duelist can’t receive aid from non-duelists. A duel is over when one duelist surrenders or is incapacitated. A duelist may not kill another duelist. Any duelist who
Compendium
- Sources->Dungeons & Dragons->Flee, Mortals! Rule Primer
immunity to the dazed condition. Flanked If your game uses the optional flanking rules in the core rules, a creature who is immune to the flanked condition can’t be flanked regardless of the position of their enemies.
this book have immunity to the dazed condition. At the GM’s discretion, a creature published in the core rules or another supplement who has immunity to the paralyzed or stunned condition also has
Compendium
- Sources->Dungeons & Dragons->Sage Advice & Errata
you have a clear line to its space? No. If you can’t see something, it’s not within your line of sight. Speaking of “line of sight,” the game uses the English meaning of the term, which has no special meaning in the rules.
Compendium
- Sources->Dungeons & Dragons->Dungeon Master’s Guide
(with their input), arbitrate the rules, and settle arguments. And when you’re narrating the action of the game, the players should be paying attention. Player Die Rolling Players should roll their dice
reroll it? When it lands cocked against a book, do you pull the book away and see where it lands or reroll the die? Work with your players to answer these questions, and record the answers as house rules
Compendium
- Sources->Dungeons & Dragons->Player's Handbook (2014)
the rules on ability checks, saving throws, and attack rolls. Your proficiency bonus can’t be added to a single die roll or other number more than once. For example, if two different rules say you can
) checks. In general, you don’t multiply your proficiency bonus for attack rolls or saving throws. If a feature or effect allows you to do so, these same rules apply.
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
Healing Hit Points can be restored by magic, such as the Cure Wounds spell or a Potion of Healing, or by a Short or Long Rest (see the Rules Glossary). When you receive healing, add the restored Hit
Points to your current Hit Points. Your Hit Points can’t exceed your Hit Point maximum, so any Hit Points regained in excess of the maximum are lost. For example, if you receive 8 Hit Points of healing and have 14 Hit Points and a Hit Point maximum of 20, you regain 6 Hit Points, not 8.
Compendium
- Sources->Dungeons & Dragons->Sage Advice & Errata
its stat block. A monster also has the option to make an Unarmed Strike as an Opportunity Attack, following the normal rules of an Unarmed Strike. An action, such as a breath weapon effect, that doesn’t
include a melee attack roll isn’t eligible to be chosen for an Opportunity Attack. Additionally, a monster can’t use its Multiattack when making an Opportunity Attack, because the use of Multiattack specifically predicates on taking the Attack action, and an Opportunity Attack takes a Reaction.
Compendium
- Sources->Dungeons & Dragons->Waterdeep: Dungeon of the Mad Mage
phylactery wins its freedom, damning the other to spend the remainder of its existence in Undermountain. By the rules of Halaster’s game, the genies can use adventurers to get the job done, but they
can’t cause bodily harm to one another, either directly or indirectly. A disgruntled mud mephit named Urm has been forced to act as the genies’ go-between.
Compendium
- Sources->Dungeons & Dragons->Dungeon Master’s Guide
their owner’s capabilities in wondrous ways. Magic Item Rules
Rules for identifying, attuning to, and using magic items appear in the Player’s Handbook. Additional rules are presented below
a snakelike tail instead of legs can’t wear magic boots.
Paired Items. You can allow exceptions to the rule that paired items must both be worn. For example, a character with only one arm might be able to use a single Glove of Missile Snaring so long as the matching glove is on their person.
Compendium
- Sources->Dungeons & Dragons->Basic Rules (2014)
bonus is used in the rules on ability checks, saving throws, and attack rolls. Your proficiency bonus can’t be added to a single die roll or other number more than once. For example, if two different
rules say you can add your proficiency bonus to a Wisdom saving throw, you nevertheless add the bonus only once when you make the save. Occasionally, your proficiency bonus might be multiplied or divided
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
The Bonus Doesn’t Stack Your Proficiency Bonus can’t be added to a die roll or another number more than once. For example, if a rule allows you to make a Charisma (Deception or Persuasion) check, you
(doubled or halved, for example) before being added. For example, the Expertise feature (see the rules glossary) doubles the Proficiency Bonus for certain ability checks. Whenever the bonus is used, it can be multiplied only once and divided only once.
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
Healing Hit Points can be restored by magic, such as the Cure Wounds spell or a Potion of Healing, or by a Short or Long Rest (see the rules glossary). When you receive healing, add the restored Hit
Points to your current Hit Points. Your Hit Points can’t exceed your Hit Point maximum, so any Hit Points regained in excess of the maximum are lost. For example, if you receive 8 Hit Points of healing and have 14 Hit Points and a Hit Point maximum of 20, you regain 6 Hit Points, not 8.
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
The Bonus Doesn’t Stack Your Proficiency Bonus can’t be added to a die roll or another number more than once. For example, if a rule allows you to make a Charisma (Deception or Persuasion) check, you
(doubled or halved, for example) before being added. For example, the Expertise feature (see the Rules Glossary) doubles the Proficiency Bonus for certain ability checks. Whenever the bonus is used, it can be multiplied only once and divided only once.
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
(with their input), arbitrate the rules, and settle arguments. And when you’re narrating the action of the game, the players should be paying attention. Player Die Rolling Players should roll their dice
reroll it? When it lands cocked against a book, do you pull the book away and see where it lands or reroll the die? Work with your players to answer these questions, and record the answers as house rules
Compendium
- Sources->Dungeons & Dragons->Vecna: Eve of Ruin
Link to Vecna The characters each gain a metaphysical link to Vecna, which follows the rules for blessings presented in the Dungeon Master’s Guide. Vecna’s Link is the result of feedback from the
secrets. You have advantage on Wisdom (Insight) checks. In addition, you can use an action to cast See Invisibility without expending a spell slot. Once you cast that spell in this way, you can’t do so
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
Adventurers can’t spend every hour adventuring. They need rest. Any creature can take hour-long Short Rests in the midst of a day and an 8-hour Long Rest to end it. Regaining Hit Points is one of the main benefits of a rest. The rules glossary provides the rules for Short and Long Rests.
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
Adventurers can’t spend every hour adventuring. They need rest. Any creature can take hour-long Short Rests in the midst of a day and an 8-hour Long Rest to end it. Regaining Hit Points is one of the main benefits of a rest. The Rules Glossary provides the rules for Short and Long Rests.
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
those points and then lose 2 Hit Points. Duration Temporary Hit Points last until they’re depleted or you finish a Long Rest (see the rules glossary). Temporary Hit Points Don’t Stack Temporary Hit
Points can’t be added together. If you have Temporary Hit Points and receive more of them, you decide whether to keep the ones you have or to gain the new ones. For example, if a spell grants you 12
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
those points and then lose 2 Hit Points. Duration Temporary Hit Points last until they’re depleted or you finish a Long Rest (see the Rules Glossary). Temporary Hit Points Don’t Stack Temporary Hit
Points can’t be added together. If you have Temporary Hit Points and receive more of them, you decide whether to keep the ones you have or to gain the new ones. For example, if a spell grants you 12
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
their owner’s capabilities in wondrous ways. Magic Item Rules
Rules for identifying, attuning to, and using magic items appear in “Equipment”. Additional rules are presented below.
Attunement
snakelike tail instead of legs can’t wear magic boots.
Paired Items. You can allow exceptions to the rule that paired items must both be worn. For example, a character with only one arm might be able to use a single Glove of Missile Snaring so long as the matching glove is on their person.
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
feet, take an action, and then go 20 feet. Dropping Prone On your turn, you can give yourself the Prone condition (see the rules glossary) without using an action or any of your Speed, but you can’t
, you can move a distance equal to your Speed or less. Or you can decide not to move. Your movement can include climbing, crawling, jumping, and swimming (each explained in the rules glossary). These
Compendium
- Sources->Dungeons & Dragons->The Wild Beyond the Witchlight
this section, follow these additional rules during character creation. Ability Score Increases When determining your character’s ability scores, increase one score by 2 and increase a different score
class offers suggestions on which scores to increase. You can follow those suggestions or ignore them, but you can’t raise any of your scores above 20. Languages Your character can speak, read, and
Compendium
- Sources->Dungeons & Dragons->D&D Beyond Basic Rules
explained in the Rules Glossary). These different modes of movement can be combined with your regular movement, or they can constitute your entire move. However you’re moving with your Speed, you deduct
noted in the monster’s stat block. See the Rules Glossary for more about Speed as well as about special speeds, such as a Climb Speed, Fly Speed, or Swim Speed. Difficult Terrain Combatants are often
Compendium
- Sources->Dungeons & Dragons->Player's Handbook (2014)
Rituals Certain spells have a special tag: ritual. Such a spell can be cast following the normal rules for spellcasting, or the spell can be cast as a ritual. The ritual version of a spell takes 10
minutes longer to cast than normal. It also doesn’t expend a spell slot, which means the ritual version of a spell can’t be cast at a higher level. To cast a spell as a ritual, a spellcaster must have
Compendium
- Sources->Dungeons & Dragons->Monster Manual (2014)
is always cast at its lowest possible level and can’t be cast at a higher level. If a monster has a cantrip where its level matters and no level is given, use the monster’s challenge rating. An innate
spell can have special rules or restrictions. For example, a drow mage can innately cast the levitate spell, but the spell has a “self only” restriction, which means that the spell affects only the
Compendium
- Sources->Dungeons & Dragons->Player’s Handbook
make ranged attacks only against targets within a specified range. If a ranged attack, such as one made with a spell, has a single range, you can’t attack a target beyond this range. Some ranged
normal range, and you can’t attack a target beyond long range. Ranged Attacks in Close Combat Aiming a ranged attack is more difficult when a foe is next to you. When you make a ranged attack roll with
Compendium
- Sources->Dungeons & Dragons->Dragons of Stormwreck Isle
Speed A creature’s speed tells you how far it can move on its turn. For more information on speed, see Speed in the Basic Rules. All creatures have a walking speed; those that have no form of ground
of its movement to move through sand, earth, mud, or ice. It can’t burrow through solid rock unless it has a special trait that allows it to do so. Fly. A creature that has a flying speed can use all
Compendium
- Sources->Dungeons & Dragons->Dungeon Master’s Guide
and as a fair arbiter of the rules. Provide Fair Warning. Let characters face the consequences of their foolish actions, but make sure you give enough cues for the players to recognize self-destructive
encounters. It’s fine to throw tough encounters at them and sometimes to let them face monsters they can’t beat. But it’s not fair if the players have no way to know they can’t win the fight or have
Compendium
- Sources->Dungeons & Dragons->Eberron: Forge of the Artificer
smaller than the rules in the Dungeon Master’s Guide specify, at the DM’s discretion, in order to fit. A mobile Bastion can’t have defensive walls.
Mobile Bastions The Bastion rules in the Dungeon Master’s Guide assume that characters establish their Bastions in a fixed location and that their adventures might take them away from their Bastions






