I have to choose between these two skill to improve it. Right now I have Aspersion level 3 and sacrament Lv2 and three skills points available. I’m building a Cleric/Priest support, which of those skills do you think it would be useful for party members?
Thanks!! 
Max out Aspersion for late game scaling defensive tool and leave sacrament at level 1 instead, because Sacrament act like a flat base scaling and hardly… its pretty rare to see people use auto-attack later on at level 200+ (Except for Archer class… but ye…)
Also, element property attack can be only increase through element attack property gears. Ex: Arde Dagger, Ledas Shield, etc.
There are much better skills like mass heal, stone skin, revive later on with C3 Priest.
This has been an age old argument for the past 2 months, I can list you opinions from brokonaut, Shawn, calcifar, meddycakes, that guy with the sexy chaplain build…ect and all of them differing opinions on which to max.
It comes down to this:
Are you playing chaplain? If no, max sacrament.
If you are, see below.
Will you buy sacrament scrolls? If yes, Max asperion.
Will you be grouping a lot vs soloing? If yes, max sacrament.