MarkB
Legend
The way I'd tend to handle it:
First, the character gives up faith in his current deity, and renounces all magical and spellcasting abilities granted by that deity.
Second, the character seeks out a priest of his new chosen religion and declares his faith. If the priest accepts his word, he is offered a choice of tasks in order to prove his new faith. Typically, the requirement would be to spend a year and a day acting as a lay priest, tending to the needs of his new religion's faithful.
Shorter-term options would include carrying out some major quest or challenge on behalf of the character's new deity. For evil deities, willingly carrying out the sacrifice of a former friend or ally would also be an option. Conversely, for a good deity the redemption of a formerly villainous enemy might be acceptable.
The character may gain Cleric levels in his new religion during this time, but his caster level, spell progression and class features all progress as though these were his first levels in Cleric.
Third, after completing his test of faith, the character presents his new church with offerings and incense worth 2,500 gp, which are then used by a priest of appropriate level as material components to cast Atonement upon the character. Once this is done, the character's new faith is cemented and the full power and spellcasting progression of his Cleric levels is restored to him, under the aegis of his new deity.
First, the character gives up faith in his current deity, and renounces all magical and spellcasting abilities granted by that deity.
Second, the character seeks out a priest of his new chosen religion and declares his faith. If the priest accepts his word, he is offered a choice of tasks in order to prove his new faith. Typically, the requirement would be to spend a year and a day acting as a lay priest, tending to the needs of his new religion's faithful.
Shorter-term options would include carrying out some major quest or challenge on behalf of the character's new deity. For evil deities, willingly carrying out the sacrifice of a former friend or ally would also be an option. Conversely, for a good deity the redemption of a formerly villainous enemy might be acceptable.
The character may gain Cleric levels in his new religion during this time, but his caster level, spell progression and class features all progress as though these were his first levels in Cleric.
Third, after completing his test of faith, the character presents his new church with offerings and incense worth 2,500 gp, which are then used by a priest of appropriate level as material components to cast Atonement upon the character. Once this is done, the character's new faith is cemented and the full power and spellcasting progression of his Cleric levels is restored to him, under the aegis of his new deity.