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Memory and mental power.
Intelligence affects your Arcana, History, Investigation, Nature, and Religion skills and improves spellcasting for Wizards, Eldritch Knights and Arcane Tricksters (better chance to hit enemies with Spell Attack Rolls; increases the Difficulty Class of spells with Saving Throws).
Intelligence Modifier Chart
Baldur's Gate 3 uses the Point Buy ruleset.
| Score | Modifier |
|---|---|
| 1 | - 5 |
| 2 - 3 | - 4 |
| 4 - 5 | - 3 |
| 6 - 7 | - 2 |
| 8 - 9 | - 1 |
| 10 - 11 | + 0 |
| 12 - 13 | + 1 |
| 14 - 15 | + 2 |
| 16 - 17 | + 3 |
| 18 - 19 | + 4 |
| 20 - 21 | + 5 |
| 22 - 23 | + 6 |
| 24 - 25 | + 7 |
| 26 - 27 | + 8 |
| 28 - 29 | + 9 |
| 30 | + 10 |