Righteous Fire + Inc Aura Effect Nodes

What does Sovereignty and the increased effect of auras do for righteous fire and the auras such as vitality, grace , and purity of fire? i know it will reduced the mana reserve but the specifics upon what the 8% + 8% and 12% nodes i dont see a difference in its affect on grace can anyone explain? thank you

increased effect of auras increase evasion you (and allies affected by your aura) get from Grace, resists from Purity auras etc

increased effect of auras does not reduce mana reserved

RF is not an Aura