Paladin · Retribution · tier 2 · from level 15

Holy Conduit

+95.2 Exorcism

2/2 · level 60 · per 100 mana · and 3 more

Holy Conduit 12

Rank 2/2

Reduces the mana cost of your Consecration, Holy Wrath, Exorcism, and Hammer of Wrath spells by 40%.

Exorcism +66.7% +95.2 Hammer of Wrath +66.7% +77.1 Holy Wrath +66.7% +43.3 Consecration +66.7% +36.1

Averages, counting crits and misses, for a level 60 Paladin with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.