Spell preparation

Some classes must choose their spells in advance of casting them.

A character can prepare only spells they know for each class.

The cleric, druid, paladin, ranger, wizard and blackguard classes require spell preperation. However clerics and druid may also use spontaneous casting.

Unprepared casting
Sorcerers, bards and assassins cast their spells without having to prepare them in advance. They may cast any of their spells known, however they generally have less spells per day than preperation spellcasters.

Spontaneous casting
Clerics and druid can use spontaneous casting to cast spells they haven't prepared in exchange for losing a spell they have prepared.

NWN comparison

 * Classes that were required to prepare their spells in NWN did so before resting.