Pathfinder - How to Play - Divine Spellcasters
Clerics, Druids, Inquisitors, Paladins, and Rangers can cast divine spells. Unlike arcane spells, divine spells draw power from a divine source. Clerics and Inquisitors, gain spell power from deities or from divine forces. The divine force of nature powers Druid and Ranger spells, and the divine forces of law and good power Paladin spells.
0-level Divine spells are called Orisons.
Preparing Divine Spells
Divine spellcasters prepare their spells in largely the same manner as wizards do, but with a few differences. The relevant ability for most divine spells is Wisdom (Charisma for Paladins). To prepare a divine spell, a character must have a Wisdom score (or Charisma score for Paladins) of 10 + the spell's level. Likewise, bonus spells are based on your spellcasting ability..
Time of Day
A divine spellcaster chooses and prepares spells ahead of time, but unlike a Wizard, does not require a period of rest to prepare spells. Instead, the character chooses a particular time of day to pray and receive spells. The time is usually associated with some daily event. If some event prevents a character from praying at the proper time, she must do so as soon as possible. If the character does not stop to pray for spells at the first opportunity, she must wait until the next day to prepare spells.
Spell Selection and Preparation
A divine spellcaster selects and prepares spells ahead of time through prayer and meditation at a particular time of day. The time required to prepare spells is the same as it is for an arcane spellcaster (1 hour), as is the requirement for a relatively peaceful environment.
When preparing spells for the day, a spellcaster can leave some of her spell slots open. Later during that day, she can repeat the preparation process as often as she likes. During these extra sessions of preparation, she can fill these unused spell slots. She cannot, however, abandon a previously prepared spell to replace it with another one or fill a slot that is empty because she has cast a spell in the meantime. Like the first session of the day, this preparation takes at least 15 minutes, and it takes longer if she prepares more than one-quarter of his spells. The Pathfinder SRD says that only Clerics can do this, but the rules have been updated and the SRD appears to be out of date in this case.
Divine spellcasters do not require spellbooks. However, a divine spellcaster's spell selection is limited to the spells on the list for her class. Druids, Inquisitors, Paladins, and Rangers have separate spell lists, but Clerics and Oracles share a spell list. A Cleric also has access to two domains determined during character creation. Each domain gives her access to a number of special abilities and bonus spells.
Recent Casting Limit
As with arcane spells, at the time of preparation any spells cast within the previous 8 hours count against the number of spells that can be prepared.
Spontaneous Casting of Cure and Inflict Spells
A good Cleric (or a Cleric of a good deity) can spontaneously cast a cure spell in place of a prepared spell of the same level or higher, but not in place of a bonus domain spell. An evil Cleric (or a Cleric of an evil deity) can spontaneously cast an inflict spell in place of a prepared spell (that is not a domain spell) of the same level or higher. Each neutral Cleric of a neutral deity spontaneously casts either cure spells like a good Cleric or inflict spells like an evil one, depending on which option the player chooses when creating the character. The divine energy of the spell that the cure or inflict spell substitutes for is converted into the cure or inflict spell as if that spell had been prepared all along.
Spontaneous Casting of Summon Nature's Ally Spells
A Druid can spontaneously cast Summon Nature's Ally in place of a prepared spell of the same level or higher. The divine energy of the spell that the summon spell substitutes for is converted as if that spell had been prepared all along.
Divine Magical Writings
Divine spells can be written and deciphered like arcane spells (see Arcane Magical Writings). A Spellcraft check can decipher divine magical writing and identify it. Only characters who have the spell (in its divine form) on their class spell list can cast a divine spell from a scroll.
New Divine Spells
Divine spellcasters gain new spells as follows.
Spells Gained at a New Level
Characters who can cast divine spells undertake a certain amount of study between adventures. Each time such a character receives a new level of divine spells, she learns all of the spells from that level automatically.
Spontaneous Casters (Inquisitors, Oracles)
Divine spontaneous casters work the same way as Arcane spontaneous casters. See Arcane Spellcasters for more information.