Sorry that part about Blessing update was outdated, I corrected it.
From what I understand is that Last Rites doesn’t give an extra hit, it makes all your hits Holy element, so they all benefit from the Holy damage boost that Sacrament gives. With the extra bonus on low health, the boost per hit is larger than the one from Blessing (before update).
Aspersion/Aspergillum is just a fixed +21~42 damage (0%-100% damage attribute) per skill level. It also only affects self instead of party.
Blessing is worst for Chaplain right now, but after update it will be better.
If you don’t take Chaplain, then you might as well keep Aspersion at 1/15 and Sacrament at 1/10 and max Blessing, Revive, Stone Skin and Mass Heal instead.

