Strength of Soul

Strength of Soul is a Tier 5 Discipline priest talent. Its effect is twofold: Strength of Soul requires 2 points to be spent in Renewed Hope.
 * Reduces the duration of any Weakened Soul debuff on the target by 2/4 seconds when you heal them with Heal, Greater Heal or Flash Heal. The Weakened Soul debuff normally lasts for 15 seconds; even a single proc of this effect can therefore reduce the time between uses of Power Word: Shield upon the target considerably.
 * Causes Inner Focus to grant you immunity to Silence, Interrupt and Dispel effects for 3/5 seconds.