This is for the game Advanced Fighting Fantasy (2nd Edition).
From the book:
This power allows the Priest to do greatly increased damage against the enemies of the God, specified for each deity. The power will last for a number of combat rounds equal to the Priest's Devotion and will allow the Priest to roll 2 separate D6’s for damage. The results of each damage roll are both applied to the target, and indeed any bonuses to the damage roll are applied to both rolls.
How it's currently used in my table:
"For a number of combat rounds equal to the Priest's Devotion, the priest can choose a target that is an enemy of their god, and then he can roll 2d6 damage against that target without having to try to hit"
What I can understand is:
"For a number of combat rounds equal to the Priest's Devotion, whenever the priest succeeds in hitting their target with their weapon, and if that target is an enemy of their god, then he can roll 2 instead of 1 dice for damage from his weapon's damage table".
If one of these interpretations is correct, which one is it? Otherwise, how does the spell work?