Some Tables Know the Vibe, Not the Rules
Dungeons & Dragons, especially 5e, is designed to move quickly, though it doesn’t always feel like it when you’re neck-deep in lore. The thing is, the table’s speed is only great until everyone remembers they’ve been playing the same rule from memory for three years and none of those memories actually match. Don’t worry, we’re here to set the record straight! These are the 20 rules players often say they understand, but definitely don’t remember as well as they think.
1. Natural 20s Don’t Solve Every Problem
Hey, a nat 20! Everyone knows the thrill of rolling one, and while it’s exciting, it doesn’t make life easier automatically. If you roll a 20 on a Strength check to lift a castle gate, the DM can still stop you because the rule doesn’t make ability checks magical. The same goes for a Charisma check to convince a king to hand over the throne. Don’t forget that a high roll can improve the outcome without rewriting the situation.
2. Critical Hits Don’t Double All Damage
A crit lets you roll the attack’s damage dice twice, but it doesn’t double every number on the character sheet. If a rogue scores a crit with a rapier and Sneak Attack, the rapier die and Sneak Attack dice are rolled twice, while the Dexterity modifier is still added once. We know it’s a little confusing, but that’s what your notes and character sheet are for!
3. Concentration Is Just as Easy to Lose
You can’t keep two concentration spells running at once (though we’d love to), so don’t forget about your concentration. Taking damage can also force a Constitution saving throw, so that carefully maintained haste spell can vanish right when the fighter needs it most.
4. Bonus Action Spells Have Limits
The bonus action spell rule isn’t just about whether you still have your action left. If you cast Healing Word as a bonus action, the only other spell you can cast on that same turn is a cantrip with a casting time of one action. Long story short, you can’t use a bonus action as your get out of jail free card.
5. Opportunity Attacks Don’t Trigger Every Time Someone Moves
It’s always nice to think we can whack a goblin on the head if he passes us, but an opportunity attack usually happens when a creature you can see leaves your reach—not whenever it moves near you. If an enemy runs in circles around you while staying within your reach, that movement doesn’t automatically give you a free swing. It also doesn’t trigger when the creature is moved without using its own action (or reaction).
6. Reactions Are a Real Resource
Speaking of reactions, yours isn’t something you can use every time the table remembers you have one. Once you cast shield, make an opportunity attack, or use counterspell, you can’t take another reaction until the start of your next turn. Sorry, squishy wizard.
7. Surprise Isn’t a Surprise Round
5e doesn’t use a separate “surprise round” where one side gets a whole extra turn before combat starts. What actually happens is that the DM determines which creatures are surprised, everyone rolls initiative, and surprised creatures can’t move or take actions on their first turn.
8. Hiding Doesn’t Make You Untouchable
When you’re hiding, you’re trying to avoid notice. It’s not that you’ve vanished from the map. If a rogue hides behind a crate and then shoots a guard, the attack can benefit from being unseen, but their position is usually outed after the attack.
9. Invisibility Isn’t the Same as Being Hidden
Invisible creatures are unseen, but that doesn’t mean nobody knows where they are. If an invisible wizard runs across gravel or shouts a spell, you bet enemies will know their location. To actually be hidden, the creature still needs to avoid being detected, so prepare to make a Stealth roll.
10. Passive Perception Isn’t a Radar
Passive Perception represents what a character notices without actively searching. Here’s the kicker, though: it doesn’t reveal every secret. A character with passive Perception 17 might notice muddy footprints by a bookcase, but that doesn’t magically identify the hidden latch.
11. Cover Changes More Than People Think
Did you know that cover can add to Armor Class and Dexterity saving throws? It’s true, and it makes battlefield position more important than players treat it! The only issue is that total cover is stricter; a creature behind a wall generally can’t be targeted directly by an attack or spell.
12. Prone Helps and Hurts
The prone condition isn’t a simple “everyone gets advantage” button. Remember that melee attacks from within 5 feet usually have advantage against a prone target—but ranged attacks from farther away usually have disadvantage.
13. Grappling Doesn’t Pin, Damage, or Silence Anyone
Okay, you’ve got that guard in a headlock…now what? While a grapple reduces the target’s speed to 0, that’s its main effect unless another rule adds more. A grappled cultist can still stab you, cast spells, shout for help, or drink a potion if the situation allows it.
14. Shoving Isn’t a Damage Roll
We’d love to shove a mind flayer on its butt and call it a day, but shoving can only push a target away or knock it prone; it doesn’t deal weapon damage by itself. It’s really only worth it if you’re a fighter with Extra Attack, which can replace one attack with a shove and still use another attack afterward.
15. The Ready Action Has a Cost
Readying an action lets you respond to a trigger, but it also uses your action now and your reaction later. Imagine this: a ranger readies an arrow for when the troll steps through the door. The ranger can fire when that trigger happens, but only if they still have their reaction! Even worse, readying a spell is more demanding because holding the spell requires concentration.
16. Spell Components Aren’t Just Flavor Text
A spell isn’t just a flick of the wrist—this isn’t Harry Potter! Verbal, somatic, and material components determine whether one can actually be cast. So, a gagged sorcerer can’t cast a spell with a verbal component. A cleric with both hands tied will have trouble with somatic movement, too. Just make sure you pay attention to what’s happening before you blow your action.
17. Armor Can Stop Spellcasting
It seems like a good idea to stuff the wizard in heavy plate mail, but wearing armor you’re not proficient with actually creates serious problems for spellcasters. A wizard (or any weaker build, really) who puts on armor without proficiency can’t cast spells, even if the character can physically move around in it.
18. Movement Can Be Split Up
Though it may seem like it, you don’t have to move all at once before or after your action. A monk can move 15 feet, attack a hobgoblin, then use the rest of their movement to duck behind a pillar if they still have movement left. This matters a lot for positioning around hazards, too; you can step into range, act, and leave if nothing stops you.
19. Jumping Still Uses Movement
Never forget that jumping isn’t free distance. If a fighter with 30 feet of movement makes a running long jump across a 10-foot pit, that 10 feet still counts against their movement. That can seriously trip you up in combat, so keep tabs on how far you go. If you’ve used most of your movement, it doesn’t matter if you’re strong enough to jump far in theory—you’re still unable to cover the distance that round.
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20. Death Saves Aren’t Exactly Simple
Death saving throws look straightforward, but damage changes things quickly. If a dying character takes damage, they suffer a failed death save, and a critical hit from an attacker within 5 feet can count as two failures. Long story short, just make sure you keep the bad guys away from your fallen comrade…who again, is probably a wizard.
