Domain

A cleric chooses two domains at their first class level, ideally representing the deity they have chosen to follow. Each domain gives the cleric access to at least 2 domain spells he can cast that is added to his spell list, as well as possibly gaining a granted power. The cleric gets the granted powers of both the domains selected.

DnD 3.5 Comparison

 * Domains grant one spell per spell level, but due to an already enhanced spell list for Clerics and the difficulty of implementing some PnP spells in NWN2, this is reduced to 2-5 spells per domain.
 * Domain choice is restricted by deity choice in PnP DnD which should be possible in custom content using the DomainID columns in the nwn2_deities.2da. Unfortunately these columns seemingly have no affect in game.
 * The evil and good alignment domains (as well as the PnP chaos and law domains) are only available if the cleric's alignment matches that domain. NWN2 does not enforce this rule, and there is unfortunately no way to add it easily in custom content. This means a good cleric of Lathander could easily choose Evil and Destruction as their domains with no penalties.