Priests are able to select at least one domain from those offered by your deity. Multiclass priests will be able to select one domain, and singleclass priests will be able to select two. This can be done at churches and temples using <pick domain x>, where x is the domain you wish to have access to.
Rangers are able to access spells from the animal and plant domains.
Paladins are able to access spells from the vigilance and protection domains.
Be aware - you cannot change your mind on a domain you choose later on, so choose wisely. Domains available to each god can be seen in the specific helpfiles for each deity, eg/ <help callamir>, and in <help deities>.
Domain spells are as follows:
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Air whispering wind, airbolt, windstorm
Animal ghost step, snakebite, rage
Cavern meld into stone, maw of stone, earthquake
Charm good hope, bliss, charm monster
Cold ice shield, frost breath, hypothermia
Creation minor creation, glyph of warding, cometfall
Darkness armor of darkness, darkbolt, listening shadow
Destruction shatter, tremor, disintegrate
Earth strength of stone, earth reaver, stone body
Evil blight, unholy orb, blasphemy
Fate auspicious bolt, aegis of fate, fortune fate
Fire fire shield, handfire, flameburst
Good bless, holy orb, holy word
Illusion displacement, screen, phantasmal killer
Knowledge comprehend languages, wieldskill, forgotten melody
Magic true seeing, mystic bolt, break curse
Mentalism insight, bolt of force, inner eye
Moon faerie fire, moonbeam, silver sight
Plant entangle, meld into nature, thorn spray
Protection divine shield, invisibility purge, teleportation ward
Renewal rejuvenation, freedom of movement, rebirth
Repose phantom steed, spectral touch, ghostform
Storms lightning touch, stormwinds, stormrage
Strength righteous might, resilience, crushing hand
Suffering body blades, kiss of torment, wave of pain
Sun nimbus of light, searing light, sunburst
Travel faithful mount, pass portal, create portal
Trickery conceal alignment, befuddle, confusion
Tyranny oppression, fear, forbiddance
Vigilance orders oath, mark of justice, weighed in the balance
War seeking sword, offensive summoning, berserker
Water cloudburst, mist of the goddess, tidal surge
See also: cleric, deities, individual help files for each deity