Spells per day

From NWN2Wiki

Spellcasters gain an amount of spells per day they can cast at each spell level derived from their class level.

A high enough ability score will also grant bonus spells to the number of spells which can be cast per day.

[edit] Red Dragon disciple

Red dragon disciples gain bonus spells as they gain levels. A bonus spell can be added to any level of spells the disciple already has the ability to cast.