Attack bonus cap
From HGWiki
In Neverwinter Nights, the maximum Attack Bonus a character can gain through magic is capped at +20.
Item bonuses which count toward the cap
- Weapon Enhancement bonus
- Weapon Attack Bonus
Arcane spells which count toward the cap
Divine spells which count toward the cap
Special abilities which count toward the cap
- Bard - Bard Song
- Champion of Torm - Divine Wrath
- Cleric - War domain's Battle Mastery