I’m still only rank 5, but I’ll tell you what I can.
Heal15 is my main damage output, Smite comes second. If something flies and isn’t a Devil/Mutant, I use Cafri.
Guardian Saint is nice, because it redirects hits entirely, so you don’t get staggered or knocked back. It’s also good for killing your guildmates. But in general, too unreliable for now. I’d also like it to have more charges per level, so it’s more than just a different Safety Zone. Refreshing market every hour now in hopes to find a GSaint gem. With incoming attribute, it’ll gain unique use of letting you tank for weaker party members.
Fade10 is great.
Discerning Evil, in my opinion, is going to be very powerful in the sword-centric meta. You have all these 5 second buffs that quadruple melee damage, and this skill can make them 19 seconds.
Indulgentia is much more reliable than Cure, easier to hit etc.
Cleric2 Diev was the other thing I was considering, but because of some personal circumstances (friend with full CON Squire3) I went with Cleric3 in the end. Definitely a great pick though.
Pardoner vs Oracle, it depends on your purpose. For PvE, I believe Pard is better, while Oracle shines in PvP.
One thing to mention, there is a popular “Zoo” build, where you Change mobs into some ridiculous stuff, and then use Conversion on them.
Whether you should get Pardoner at R5 or R7, taking it right away gives you stronger R5, and waiting gives you stronger R6. Personally I prefer taking it first, makes a lot of missions go by faster.