The effects of this spell depend on the deity you worship.
Chondra:
Natures call: Summon a creature for 18 seconds+6 seconds/level
Storm:
Cure light wounds: heal 1d8+1/level
Am:
Magic missile: single magic missile only at 1d4+1 damage
Crog:
Bless: Grants nearby allies +1 to hit and damage.
Belwar:
Magic Weapon: Temporary +1 enhancement bonus to a weapon.
Reann:
Detect Undead: Undead revealed on minimap.
Greyre:
Sanctuary: Nearby enemies ignore caster.
Teris:
Entropic Shield: 20% of ranged attacks miss caster.
Kieron:
Daze: Weak enemy is dazed.
Air:
Ray of Air: Inflicts 1-3 air damage.
Earth:
Ray of Earth: Inflicts 1-3 earth damage.
Fire:
Ray of Fire: Inflicts 1-3 fire damage.
Water:
Ray of Water: Inflicts 1-3 water damage.
Life:
Ray of Life: Inflicts 1-3 life damage on unlife, heal 1-3 on life
Unlife:
Ray of Life: Inflicts 1-3 life damage on life, heal 1-3 on unlife