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Keywords are:  'cleric spell sunbeam'

Spell: sunbeam                  Mana:   8  Wis: 24  Chr: 20  Lvl 16 Cler  (28%)
                                (helpful)   Requires: radiant orbs
                                Group: Cleric divine conjuration spellgroup
                                Damage Type: magic beam
                                Damage: low (special, see text)  
                                Speed: very fast

Usage:
cast sunbeam <target>

'Sunbeam' builds upon the 'radiant orbs' spell, focusing the conjured
light into beams that cut into the target, searing and scorching them.
The beams of divine light deal extra damage to undead, shadow and
ethereal creatures.

If you have a continual light spell active, a beam radiates from the ball
of light instead of you. This increases the power and damage of the spell.