As a C1 Cleric > C2 Priest > C2 Paladin, here are my thoughts:
Smite
Good skill for demon/mutant killing, not as good (even with knockback) at killing other stuff. It’s nice in dungeons filled with deamons, but other players have more reliable ways of dealing damage.
Knockback can be useful at saving allies, but most of the time is not. Most of my damage comes from Blessing 10 (+50 atributes) and 5 sacrament.
The small delay before the hit also is a problem, considering it can be easily interrupted (and it is).
BUFF - A third overheat or 2 seconds less of cooldown would be nice for it as a buff. We should be able to use more times the skill, considering the delay and the possibilities of interrupts/escapes in the meantime.
Restoration
If you are going like me for a C2 Cleric, the restoration lvl 5~15 is a god send in terms of raw healing. Not to mention the fact that you can help yourself sustain more uptime on your support role with it up, thanks to the SP recovery.
My problem with it comes from the recovery mechanics in the game. It takes too long to tick, making it not as good as it could be. But, as I recall, Krivis has the recovery speed buff in this case. Wouldn’t know how to actually help with this.
BUFF - Increase defense by x% via atribute (+10% tops). Having the restoration aura up is something that is quite useful, but it doesn’t help me support better, unless linked directly with heals. Adding some physical defense (extra armor maybe) could make it more useful.
Resist Elements
A rather dissapointing aura, it increase my magical defense, but it is on such a long CD that I almost never use it, since most my parties destroy most things before it before relevant. Bosses can be useful, but having it at 10 gives me 110 seconds up time with a 180 CD. My Restoration aura has a 60 second uptime with a 65 second CD, which is good.
The magic defense decrease on monsters is useful, but at such a long CD, can’t contribute more to the cause, plus the nulifing aspect of the aura. 19% at max level and atributes brings to much RNG to it.
Buff- Would prefer a straight 19% decrease on magical source damage from it, instead of the nulification. Wouldn’t even need to decrease the CD, as long as that RNG comes down and bring consistent utility with it.
Turn Undead
A meh skill on my part. Considering paladins are good solo builds mostly, having 5 points on this skill with an RNG property to kill (based on SPR, which limits builds, since we don’t have the formula of it) with low damage on fail, with a 70 second CD, I wouldn’t put 5 points in this not for anything other the paladin has to offer.
Buff - Change it for a fear type skill, or whatever. Make the mobs run away. I prefer it as a “OH ■■■■” button that an instant kill I can’t count on. Specially since other classes will have MUCH more firepower then me more consistently. Make the mobs run away from you for 15 seconds, in a 30 second CD. That’s me though, on the account of having purchased it before, and not used it very much, relying more on my normal ways of dispensing damage.
Conviction
Straight up useless skill. Cast it, beat mobs up, don’t get convictions out of it. At least at what I saw.
Buff - can’t recomend one, except a complete skill redesign. Maybe I was using it wrong. Still, not useful as my main way of dealing damage.
That’s it for now.