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Memory and mental power.
Intelligence affects your Arcana, History, Investigation, Nature, and Religion skills. It also improves spellcasting for wizards, Eldritch Knights and Arcane Tricksters, by increasing the chance of hitting an enemy with spell attack rolls, due to the increased Difficulty Class of spells with saving throws.
Intelligence modifier chart
Baldur's Gate 3 uses the Point Buy ruleset.
| Ability score | Modifier value | Ability score | Modifier value | |
|---|---|---|---|---|
| 1 | -5 | 16-17 | +3 | |
| 2-3 | -4 | 18-19 | +4 | |
| 4-5 | -3 | 20-21 | +5 | |
| 6-7 | -2 | 22-23 | +6 | |
| 8-9 | -1 | 24-25 | +7 | |
| 10-11 | +0 | 26-27 | +8 | |
| 12-13 | +1 | 28-29 | +9 | |
| 14-15 | +2 | 30 | +10 |
Related items
Sets intelligence
Warped Headband of Intellect sets Intelligence to 17
Decreases intelligence
Harmonium Halberd reduces Intelligence by -1
+1 to saving throws
Advantage on saving throws
Aberration Hunters' Amulet, only for githyanki
Fey Semblance Amulet
Silver Sword of the Astral Plane only for githyanki
Other
The Pointy Hat, grants a bonus to Persuasion ability checks, equal to your Intelligence modifier