Serendipity

Serendipity is a passive level 34 Holy priest ability. It reduces the cooldown of Holy Word abilities when other spells are cast:
 * Holy Word: Serenity: Flash Heal, Heal, Binding Heal
 * Holy Word: Sanctify: Prayer of Healing, Binding Heal
 * Holy Word: Chastise: Smite

Improvements

 * Piety causes Prayer of Mending to also reduce the cooldown of Holy Word: Sanctify.