Sunbeam
From HGWiki
Caster Level(s): Druid 8; Cleric 8; Cleric with sun domain 7
Innate Level: 8
School: Evocation
Descriptor(s): Divine (not loot breaking)
Component(s): Verbal, Somatic
Range: Medium (20 metres)
Area of Effect / Target: Colossal (10 metre radius)
Duration: 3 Rounds
Additional Counter Spells: Create Greater Undead
Save: Reflex Negates
Spell Resistance: Yes
Description: The caster summons a globe of divine radiance to blind and burn those within the area of effect. Undead take 1d6 points of Divine damage per caster level to a maximum of 30d6. All other monster types take 15d6 points of Divine damage and are blinded for 3 rounds. At caster level 41 , undead take an additional 1d6 per legendary caster level and all others 1d6 per 2 legendary caster levels. A successful Reflex save halves the damage for undead and avoids the blindness for others.
Notes:There are two reflex saving throws. Every creature makes the first one (at full DC) to avoid being blind. If and only if this save is successfully made a second reflex save may be made (at 0 DC with evasion/improved evasion factored in) to halve the damage.