By the current wording (which is different than the horned helm) still does tend to imply its a single 1d6 you add to the attack (also implying it is a single d6 that gets added to a single target for fireball). That said, it definitely needs some clarification because that fireball point doesn't sit well with me.
The intention of the item, I suspect, is to add 1d6 to the first damage roll the power uses. Multi-attack powers would get it added to each target (since you only perform one damage roll), but sustained powers would not continue to add the 1d6 each time it was sustained. This is how I'd errata it in my game anyways.
The intention of the item, I suspect, is to add 1d6 to the first damage roll the power uses. Multi-attack powers would get it added to each target (since you only perform one damage roll), but sustained powers would not continue to add the 1d6 each time it was sustained. This is how I'd errata it in my game anyways.