Free tables Natural 1 — saving throws and ability checks

Natural 1 Table — Intelligence Saves and Checks, d100

A free d100 table for a natural 1 on a Intelligence save or check in 5e. 100 outcomes, graded by severity.

Fifth edition does not critically fail saving throws or ability checks either: a natural 1 is just a 1, and on a check it can still succeed if the modifier is high enough. This table is for DMs who want the genuinely bad roll to land as something, and it is graded so that most results cost very little.

Written for Intelligence specifically. A blown Intelligence roll should fail in a way that has something to do with Intelligence — which is why this is six tables and not one.

Roll d100 when a player rolls a natural 1 on a saving throw or ability check and you want the moment to land.

Severity tiers

Each result names its tier, so you can see at a glance how bad a roll was without decoding a colour.

Slip 1–20 — A moment's failure. It costs you nothing but composure.
Stumble 21–40 — A real but minor cost — tempo, position, or grip.
Lapse 41–60 — The attempt is gone, and so is your turn or your footing.
Debacle 61–80 — You are now measurably worse off than before you tried.
Ruin 81–95 — Real loss. Someone is going to remember this one.
Infamy 96–100 — Rare, spectacular, survivable. Describe it in loving detail.

The table

100 results. Roll d100.

d100	Result	Tier	What happens
1	Drew a Blank	Slip	It's on the tip of your tongue and refuses to come. No mechanical effect.
2	Misread a Word	Slip	You catch it yourself a moment later. No effect.
3	Headache	Slip	A dull pressure behind the eyes. No mechanical effect.
4	Lost Your Thread	Slip	You have to start the reasoning over. No effect.
5	Wrong Script	Slip	You were reading it as entirely the wrong language. Harmless once you notice.
6	Dropped Your Notes	Slip	One light item you were holding falls into your space.
7	Muttering	Slip	Anything within 30 feet that can hear knows someone is here, talking to themselves.
8	Eye Strain	Slip	You have disadvantage on your next Perception check.
9	Second-Guessed	Slip	You can't take a bonus action this turn if you haven't already used it.
10	Half-Remembered	Slip	You recall the fact but not where you learned it, which makes it hard to trust. No effect.
11	Ink on Your Hands	Slip	And now on your face. Entirely cosmetic.
12	Counted Wrong	Slip	No effect. You recount and get there.
13	Wrong Shelf	Slip	The answer simply isn't where you looked for it. No effect.
14	Distracted	Slip	You have disadvantage on your next Investigation check.
15	Tongue-Tied	Slip	You have disadvantage on your next Charisma check as you try to explain yourself.
16	Overthought It	Slip	No effect. The answer was much simpler than you assumed.
17	Forgot a Name	Slip	No mechanical effect, but you'll have to ask someone, out loud, in front of everyone.
18	Cramped Hand	Slip	You have disadvantage on the next check you make using tools.
19	Doubted Yourself	Slip	No effect. You were right the first time, and the DM should let you find that out eventually.
20	Saw the Flaw	Slip	The failure shows you where your reasoning went wrong. No penalty, and you have advantage on your next Intelligence check.
21	Confidently Wrong	Stumble	The DM tells you something plausible and completely false. You believe it until something proves otherwise.
22	Dropped It	Stumble	You drop whatever you were holding in one hand.
23	Mental Fog	Stumble	You have disadvantage on your next attack roll.
24	Absorbed	Stumble	You grant advantage to the next attack roll made against you before the start of your next turn.
25	Slow to React	Stumble	You can't take reactions until the start of your next turn.
26	Train of Thought Snapped	Stumble	If you're concentrating on a spell, make a DC 10 Constitution saving throw or lose concentration.
27	Misfiled	Stumble	You have disadvantage on the next Intelligence check you make.
28	Said It Out Loud	Stumble	You reveal something you meant to keep to yourself. The DM decides who heard.
29	Numbers Wrong	Stumble	You misjudge a distance, a count, or a duration by roughly half, and act on it.
30	Slow	Stumble	On your next turn you can move or take an action, not both. Bonus actions still work.
31	Migraine Building	Stumble	You have disadvantage on Intelligence saving throws until the end of your next turn.
32	Nosebleed	Stumble	You take 1 damage.
33	Rooted in Thought	Stumble	You can't move for the rest of this turn.
34	Talked Over an Ally	Stumble	An ally within 5 feet loses their thread. Their next attack roll is made with disadvantage.
35	Predictable	Stumble	The next creature to make a saving throw against an effect you create has advantage on it.
36	Loud Realisation	Stumble	One nearby creature of the DM's choice comes to find out what you just shouted about.
37	Fumbled the Reference	Stumble	You have disadvantage on the next check you make using tools.
38	Notes Scattered	Stumble	A piece of your visible gear falls into your space.
39	Wrong Conclusion Shared	Stumble	An ally acts on your bad information. The DM decides what that costs them.
40	Head in Hands	Stumble	You aren't prone, but pulling yourself together costs 5 feet of movement.
41	Blank	Lapse	Nothing comes at all. Your turn ends immediately.
42	Dropped Everything	Lapse	Everything you're holding falls into your space.
43	Lost the Page	Lapse	The book, map, or scroll you were working from lands 10 feet away.
44	Completely Lost	Lapse	You can't take the Search or Study action on your next turn.
45	Splitting Head	Lapse	You take 1d4 psychic damage.
46	Frozen	Lapse	You're incapacitated until the end of your next turn.
47	Rooted	Lapse	Your speed is 0 until the end of your next turn.
48	Concentration Broken	Lapse	You lose concentration on any spell you're maintaining. No saving throw.
49	Wandered	Lapse	You're moved 10 feet in a direction the DM chooses, and you don't notice it happening.
50	Believed It	Lapse	If there is an illusion, disguise, or lie in play, you're entirely convinced by it until shown hard proof.
51	Misled an Ally	Lapse	An ally within 5 feet acts on your error. Their next attack roll is made with disadvantage.
52	Shaking	Lapse	You have disadvantage on all attack rolls until the end of your next turn.
53	Corrupted Memory	Lapse	The DM quietly replaces one thing you know with something false, and does not tell you which.
54	Eyes Won't Focus	Lapse	You're blinded until you use an object interaction to clear them.
55	Damaged the Source	Lapse	A non-magical book, map, or note you were using is damaged. Still legible, barely.
56	Said It Loudly	Lapse	Every creature within 60 feet that can hear knows where you are and roughly what you're doing.
57	Reeling	Lapse	You have disadvantage on Constitution saving throws until the end of your next turn.
58	Backed Away	Lapse	You're moved 10 feet in a direction the DM chooses and fall prone.
59	Nothing Left to Give	Lapse	You can't cast a spell of 1st level or higher on your next turn.
60	Collapse	Lapse	You fall prone and drop whatever you were holding.
61	Splitting Migraine	Debacle	You have disadvantage on Intelligence checks until you finish a short or long rest.
62	Psychic Feedback	Debacle	You take 1d6 psychic damage.
63	Cost an Ally	Debacle	An ally within 5 feet takes 1d4 psychic damage as your panic spreads to them.
64	Concussed Thinking	Debacle	You have disadvantage on Intelligence saving throws until someone succeeds on a DC 13 Medicine check.
65	Lost the Source	Debacle	The book, map, or component you were using is flung 20 feet in a random direction.
66	Mind Blanked	Debacle	You're stunned until the end of your next turn.
67	Disorganised	Debacle	You can't find anything. Retrieving any item from your pack costs an action until you finish a short rest.
68	Wandered Into It	Debacle	You fall prone and are restrained by something you walked straight into without noticing.
69	Sight Swims	Debacle	You're blinded until the end of your next turn.
70	Made It Worse	Debacle	Your interference sets things back. The DC to solve, decipher, or investigate this increases by 5 for everyone.
71	Source Ruined	Debacle	A non-magical book, scroll, or map is destroyed. A magical one is merely scrambled and unusable until restored over a short rest.
72	Walked Into Danger	Debacle	You stumble into the nearest hazard or hostile creature's reach and provoke an opportunity attack from everything that can reach you.
73	Lingering Ache	Debacle	You have disadvantage on Intelligence saving throws until you finish a long rest.
74	Confused the Party	Debacle	Every ally within 5 feet has disadvantage on their next ability check.
75	Dropped Your Light	Debacle	Your light source falls and goes out — or rolls 15 feet away if it can't be extinguished.
76	Down and Reeling	Debacle	You fall prone, and your speed is 0 until the end of your next turn.
77	Spilled Pack	Debacle	One item from your inventory — DM's choice, never an attuned one — falls into your space.
78	Hands Forgot	Debacle	You drop everything you're holding and can't pick anything up until the end of your next turn.
79	Said the Name	Debacle	You speak aloud something that should not have been spoken. Something takes notice and arrives in 1d4 rounds.
80	Overloaded	Debacle	You take 1d6 psychic damage and fall prone.
81	Led Them Wrong	Ruin	An ally acting on your information walks straight into it and takes 2d6 damage of a type the DM chooses.
82	Source Destroyed	Ruin	The book, scroll, or map is destroyed outright. A magical one survives but is unusable until an hour's work restores it.
83	Mind Torn	Ruin	You take 2d6 psychic damage and have disadvantage on attack rolls until you regain any hit points.
84	Recoiled	Ruin	You're thrown 15 feet by the shock of it, land prone, and take 1d6 psychic damage.
85	Exhausted	Ruin	You gain one level of exhaustion.
86	Memory Lost	Ruin	You can't recall one specific thing — a name, a route, a password — until a lesser restoration or a long rest. The DM chooses, and it should be inconvenient.
87	Triggered It	Ruin	A ward, glyph, or mechanism you were studying goes off. Every creature within 5 feet must succeed on a DC 13 Dexterity saving throw or take 2d6 damage of the DM's choosing.
88	Attracted Attention	Ruin	A wandering monster or reinforcement of the DM's choice arrives in 1d4 rounds.
89	Let Something Go	Ruin	Anything you were holding, warding, or keeping bound breaks free immediately.
90	Handed It Over	Ruin	The object you were studying ends up in a hostile creature's space, free for it to take.
91	Everything Falls	Ruin	You drop what you were holding, your pack, and one other item, each into a different space within 10 feet.
92	Concussed	Ruin	You're stunned until the end of your next turn, and have disadvantage on Intelligence checks until you finish a long rest.
93	Made It Impossible	Ruin	This can't be deciphered, investigated, or recalled again this scene. The party needs another way.
94	Ally Trapped	Ruin	An ally within 5 feet is caught by what you set off and restrained. Freeing them takes an action and a DC 13 Athletics check.
95	Out of the Fight	Ruin	You fall prone, drop everything, and your turn ends. You can't take reactions until the start of your next turn.
96	Set It All Off	Infamy	Every ward, glyph, and mechanism in the area triggers at once. The DM introduces a hazard or a countdown. You take 2d6 damage and fall prone.
97	Gone Entirely	Infamy	The book, map, or component leaves the scene — into the fire, down the shaft, out the window. Recovering it is a side quest, not an action.
98	Hurt the One You Meant to Help	Infamy	The ally nearest to you takes 4d6 damage, or half as much on a successful saving throw of the DM's choosing (DC 13).
99	Out Cold	Infamy	The strain drops you. You're unconscious for 1 minute, or until you take damage or an ally uses an action to rouse you.
100	The One They'll Tell Stories About	Infamy	You announce your conclusion with total confidence, at volume, and it is spectacularly, provably wrong within seconds. Every creature that can see you has advantage on attack rolls against you until the start of your next turn — you are standing there with your mouth open. The DM should have a stranger quote you back to yourself in a later session.

Questions

Is a natural 1 an automatic failure on a check?

No. Automatic failure on a 1 applies to attack rolls and death saves. On an ability check or a saving throw, a natural 1 is just a 1 — add your modifier, and a skilled character can still succeed.

When should I roll on this?

Only when the failure matters. A natural 1 on a check nobody was watching is not a story.