Removing it is overkill, as it can be rather amusing to use.
It must simply be brought in line with others AOE skills.
Fatecarver is an anomaly, being a multitarget skill that's as powerfull as the best ST skills around.
Either by way of cutting the damage on secondary targets (like, by a lot .. 50% comes to mind) or reducind damage as a whole.
Both would be fine.