insert_attributes-standard-tab.html
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Wishing for Ability Scores
The higher your ability score currently is, the more wishes it takes to increase it. See below:
15 or lower: Each wish raises the ability score one point. 1 wish is need to increase Dexterity from 15 to 16. DMG (Revised / Black book) p. 16
16-20: Each wish raise the ability score one-tenth of a point. 10 wishes is needed to raise Dexterity from 16-17. DMG (Revised / Black book) p. 16
Warriors with 18 Strength: Each wish increase the exceptional strength percentile score by 10 percent. It takes 11 wishes to reach Strength 19. DMG (Revised / Black book) p. 16
21-25: Each wish raises the ability score one-twentieth of a point. 20 wishes is needed to increase Dexterity from 21 to 22. DMG (Original / Blue book) p. 12 & Sage Advice 238 p. 80