Reduces the mana cost of all spells by 50% for 15 sec.
Divine Illumination reduces the mana cost of all spells by 50% for 15 sec.
Tips & Tricks
Divine Illumination has no mana cost of its own, making it perfect for "clutch" situations.
In a sustained boss fight, a healing Paladin should fire this off at the start of the battle (or when he starts healing), thus keeping his mana usage low, while being able to recast it every three minutes afterward.
In a situation where holy light will only sometimes be required, it may be useful to save this spell until that point. Because holy light has a much higher mana cost than flash of light, this can save you significant amounts of mana.