Senses and Intuitions.
Wisdom affects your Animal Handling, Insight, Medicine, Perception, and Survival skills and improves spellcasting for Clerics, Druids, Monks and Rangers (better chance to hit enemies with Spell Attack Rolls; increases the Difficulty Class of spells with Saving Throws).
Wisdom 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
Increases Wisdom "to"
- None
Increases Wisdom "by"
Harmonium Halberd reduces 
by -1
Khalid's Gift increases by +1 (up to 21)
+1 to Saving Throws
Circlet of Psionic Revenge (only if Githyanki)
Cerebral Citadel Armour (Illithid Protection)
Phalar Aluve (Sing: +1d4)
Advantage on Saving Throws
Amulet of the Harpers
Fey Semblance Amulet (Semblance of Fey)
Blackguard's Plate
Selune's Spear of Night (Selune's Blessing)
Silver Sword of the Astral Plane (Githborn Psionic Resistance: if Githyanki)
Other
Helmet of Autonomy (Proficiency in Wisdom Saving Throws)
Boots of Uninhibited Kushigo (Experienced And Deadly: Deal additional damage equal to your Wisdom Modifier with unarmed strikes)