The difference between a Spell Save DC of 13 and a DC of 17 is not four points. In BG3 combat, it is the difference between Hold Person landing reliably and being blocked by an unlucky enemy roll half the time. Most guides cover the formula. Few show what specific DC numbers mean against real enemies in Acts 2 and 3. This chart covers both.
Below you will find the complete saving throw reference — every ability save, the spells that target it, class proficiencies, and DC thresholds that correspond to actual encounter results. Verified against BG3 mechanics as of 2025. Values may change with future updates.
BG3 Saving Throw Chart: Quick Reference
All six ability saves, what spells force them, which classes resist them natively, and how frequently each type appears in standard encounters:
| Ability Save | Common Spells That Force It | Classes With Proficiency | Frequency in Combat |
|---|---|---|---|
| Strength (STR) | Thunderwave, Arms of Hadar, Ensnaring Strike | Barbarian, Fighter | Medium |
| Dexterity (DEX) | Fireball, Lightning Bolt, Web, Grease, Hypnotic Pattern | Rogue, Ranger | Very High — most common |
| Constitution (CON) | Cone of Cold, Shatter, Concentration checks | Barbarian, Fighter, Sorcerer | High — Concentration |
| Intelligence (INT) | Phantasmal Force | Rogue, Druid | Low — rarely targeted |
| Wisdom (WIS) | Hold Person, Fear, Charm Person, Dominate Person | Cleric, Druid, Warlock | High — most impactful |
| Charisma (CHA) | Tasha’s Hideous Laughter, Command | Bard, Sorcerer, Warlock, Paladin | Medium |
The Two Formulas: Attacker and Defender
Every saving throw in BG3 runs two separate calculations simultaneously. Understanding both sides is what separates an adequate spellcaster from a reliable one.
Your Spell Save DC (the attacker’s side):
Spell Save DC = 8 + Proficiency Bonus + Spellcasting Ability Modifier
This number is fixed the moment you cast. You do not roll. A Sorcerer at level 9 with 20 Charisma (+5) and proficiency bonus +4 sets their DC at 8 + 4 + 5 = 17. Every enemy they target with a Wisdom-targeting spell must roll 17 or higher — including modifiers — to resist.
The defender’s saving throw roll:
Roll = d20 + Ability Modifier + Proficiency Bonus (if proficient in that save)
The enemy rolls a d20, adds their relevant ability modifier, and adds their proficiency bonus if they have proficiency in that save type. If their total meets or exceeds your DC, the spell fails — or, for DEX saves on most AoE spells like Fireball, deals half damage on a success.
The practical math: at DC 17 against a standard humanoid with +2 Wisdom and no proficiency, they need a 15 or higher on the d20, which happens 30% of the time. Your Hold Person lands 70% of the time. Drop your DC to 13 and they only need an 11+, succeeding half the time. Same spell slot, half the return.
Spell Save DC by Level
Your proficiency bonus grows on a fixed schedule shared across every class. Combined with your primary ability score, it sets your DC ceiling at each character level:
| Level Range | Proficiency Bonus | Score 18 (+4 mod) | Score 20 (+5 mod) | Max DC (no equipment) |
|---|---|---|---|---|
| 1–4 | +2 | DC 14 | DC 15 | 14–15 |
| 5–8 | +3 | DC 15 | DC 16 | 15–16 |
| 9–12 | +4 | DC 16 | DC 17 | 16–17 |
| 9–12 + equipment | +4 | DC 17+ | DC 18–19 | 18–19+ |
Level 9 is the practical threshold for optimised spellcasters. With a 20 in your primary stat and proficiency bonus +4, you hit DC 17 — the point where most non-boss humanoids without save proficiency fail Wisdom saves more than two-thirds of the time. Equipment bonuses push this to 18–19 in Act 3, where spellcaster dominance against standard enemies becomes near-total.
Saving Throw Proficiency by Class
Each class grants proficiency in exactly two saving throws at character creation. These determine your own defensive coverage — and where a one-level multiclass dip can eliminate a critical weakness:
| Class | Save Proficiencies | Spellcasting Ability |
|---|---|---|
| Barbarian | Strength, Constitution | None |
| Bard | Dexterity, Charisma | Charisma |
| Cleric | Wisdom, Charisma | Wisdom |
| Druid | Intelligence, Wisdom | Wisdom |
| Fighter | Strength, Constitution | Intelligence (Eldritch Knight) |
| Monk | Strength, Dexterity | None |
| Paladin | Wisdom, Charisma | Charisma |
| Ranger | Strength, Dexterity | Wisdom |
| Rogue | Dexterity, Intelligence | Intelligence (Arcane Trickster) |
| Sorcerer | Constitution, Charisma | Charisma |
| Warlock | Wisdom, Charisma | Charisma |
| Wizard | Intelligence, Wisdom | Intelligence |
Two patterns stand out. Clerics and Druids carry Wisdom proficiency, protecting against the most dangerous enemy mind-control effects in Acts 2 and 3. Sorcerers are the only pure spellcaster with Constitution proficiency natively — meaning their Concentration spells survive hits without a multiclass investment. Wizards who want the same Concentration stability typically dip one level of Fighter for exactly this reason.
Build Impact: Stacking Your Spell Save DC
For offensive spellcasters — Sorcerer, Wizard, Cleric, Warlock, Druid, Bard — Spell Save DC is the functional equivalent of attack modifier for martial classes. Every point raises the percentage of your spells that land. The levers for raising it, in order of impact:
- Primary ability score to 20: The single highest-leverage upgrade available. Use your first two Ability Score Improvements at levels 4 and 8 to push your spellcasting ability to 20 before spending ASIs anywhere else. Each +1 to the modifier raises DC by 1 — a 5% swing in success rate against most enemies. Everything else is secondary until this is done.
- DC-boosting equipment: Several items in BG3 provide flat +1 or +2 bonuses to Spell Save DC. The Spellsparkler, Hat of Fire Acuity, and subclass-specific pieces stack with your base formula, pushing a DC 17 build to 18–19 in Act 3 without multiclassing.
- Fixed-score headgear: The Warped Headband of Intellect sets Intelligence to 23, bypassing the ASI grind entirely for Intelligence-based casters. A Wizard who equips it at level 5 immediately exceeds what two manual ASIs would produce. Similar fixed-score items exist for other abilities in later acts.
- CON proficiency for Concentration: This does not raise your DC but protects it. Losing a Concentration spell — Hold Person, Web, Hypnotic Pattern — to a failed CON save after taking a hit wastes the spell slot entirely. One Fighter level grants CON proficiency and removes most of that variance for classes that lack it natively.
Which Save to Target: Attacker Strategy
Once your DC is set, knowing which save type to force against specific enemy groups becomes the next layer of optimisation. Enemy save modifiers and proficiencies are not uniform:
- Wisdom saves: The highest-value target against most humanoid enemies. Duergar, Githyanki soldiers, cultists, and standard Act 2 and 3 humanoids typically have low Wisdom scores and no proficiency. Hold Person and Dominate Person targeting WIS are the most action-efficient tools in a caster’s kit — a paralysed enemy grants advantage on all attacks against it and auto-crits on melee hits within range.
- Dexterity saves: Forced by the most common AoE damage spells — Fireball, Lightning Bolt, Grease, Web. The key advantage: DEX saves deal half damage on a successful resist, so the action is never entirely wasted even when enemies roll high. Most enemies have middling DEX without proficiency.
- Strength saves: Effective against undead, constructs, and heavily armoured enemies who often have low STR scores. Thunderwave and Arms of Hadar hit this save reliably in those matchups.
- Constitution saves: Shatter and similar CON-targeting spells serve a specific purpose — forcing enemy casters maintaining Concentration to drop their active spells. Against enemy spellcasters, breaking their Concentration is often the most efficient play available.
Player Type Guide: How to Approach This System
| Player Type | Saving Throw Priority | Skip Until You Are Ready |
|---|---|---|
| New player | Start with 16+ in your spellcasting ability and raise it to 20 with your first two ASIs. Pick spells targeting WIS and DEX — most enemies fail both at DC 14+. | Equipment bonuses, enemy proficiency tracking, multiclass dips |
| Casual player | Target DC 16 by level 8. Pick one primary save type to own and build your spell list around it. WIS is the highest-value choice for crowd control. | CON proficiency optimisation, per-encounter analysis |
| Optimiser | Hit DC 17 by level 9 (score 20 + proficiency +4). Layer equipment bonuses. Ensure CON proficiency via Fighter dip or Sorcerer base. Track enemy save proficiencies in boss fights. | Nothing — every point matters |
| Completionist | Map enemy save proficiencies and modifiers per encounter. Rotate spell schools to target the weakest save available in each fight across all three acts. | Nothing — full picture needed |
If you are still choosing a class and want to understand how the three best spellcaster options handle these mechanics, our BG3 beginner’s guide covers class-specific ability priorities and the Act 1 decisions you cannot undo.
FAQ
What is a good Spell Save DC in BG3?
DC 15–16 carries you through Act 2 without major resistance issues. DC 17+ is the practical Act 3 threshold — at that level, most non-boss humanoids without save proficiency fail Wisdom and Strength saves more than 65% of the time. Below DC 13, Concentration spells become inconsistent enough that the spell slot investment rarely returns full value.
What is the highest possible Spell Save DC in BG3?
The base ceiling at level 12 is DC 17 (proficiency +4, ability modifier +5). Equipment and subclass features push this to 18–20 in optimised Act 3 builds. The Birthright helm adds +2 Charisma for Sorcerers and Warlocks specifically, and several other items provide flat DC bonuses that stack with the base formula.
Do enemies have Spell Save DCs too?
Yes. Enemy spellcasters use the same formula. Mindflayers, Drow Mages, and Githyanki Kith’rak casting spells force your party to roll saving throws against their DC — typically 16–18 for high-threat enemies. Your characters without Wisdom or Charisma proficiency are the most exposed to mind-control and charm effects in late-game encounters.
How does advantage affect saving throws?
Advantage on a saving throw means rolling two d20s and using the higher result, raising the average roll from 10.5 to approximately 13.8. The Paladin’s Aura of Protection adds your Charisma modifier to every nearby ally’s saving throws — at Charisma 18, that is +4 to all saves within a 10-foot radius, one of the most powerful passive auras in the game. Gnome Cunning grants advantage on Intelligence, Wisdom, and Charisma saves as a racial feature.
How do death saving throws work?
Death saving throws run as a separate system — no enemy sets a DC. When a character drops to 0 hit points, they roll a d20 at the start of each turn with no modifiers added. Roll 10 or higher: success. Roll 9 or lower: failure. Three successes stabilise the character; three failures mean death. A natural 1 counts as two failures simultaneously.
Once your spellcaster build is set, protect your Act 3 progress — our guide to BG3 save file locations and Steam Cloud backup shows exactly where your saves live and how to back them up before a long run.
Sources
- Saving Throws — bg3.wiki
- BG3 Saving Throws Explained — Deltia’s Gaming
- BG3 Saving Throws Explained — Screen Rant
I've been playing video games for over 20 years, spanning everything from early PC titles to modern open-world games. I started Switchblade Gaming to publish the kind of accurate, well-researched guides I always wanted to find — built on primary sources, tested in-game, and kept up to date after patches. I currently focus on Minecraft and Pokémon GO.