Cleric in Harn have always struck me as a bit like the old D&D clerics.
IMO, Miracles should be rare, unpredictable, and most likely granted to those with divine favor, advancing the interests of that Diety, etc. etc.
The Piety costs don't seem to be the best mechanic to me - you can havethat cleric who performs all the rituals, yet does not believe in advancing the favor of the god, could be of an almost heretical mindset, bet yet is capable of doing these miracles.
The solution I use is to charge PP but to reward proper invocation use with some PP afterwards, sometimes less and sometimes more than the cost just paid. By proper use, I mean of course several things: does it advance the church's or deity's agenda (some churches want to keep a low profile, others seek converts), does it conflict directly with the works of another deity (apparently the Kelestian pantheon keeps count of each other's CPs, Concordat Points), do the intent and goal appear in harmony with the deity's principles, and more importantly, does it bother the GM? So casting a low circle invocation in a proper situation may actually result in a net PP gain (for the 'good works') while casting a high circle invocation for trifles will surely result in a net PP loss. Of course if the invocation fails the PP are lost and not likely to be regained since nothing happened.
This is a good way to modify or work within the Piety points method IMO.
A priest does his duties blesses people's fields, conducts mairrages, etc all without personal PP cost - only if he is asking for his own benefit or expending his personal piety to enhance other's chance of recieving divine favor does he employ his own PPs to conduct ritual calls.
I like this way as well, Feanor. Blessing believers and fields shuold not take from the priests piety - Actually, I would think with many gods, this is a requirement of being a priest, i.e. expected by the god, and not doing so could incur the gods wrath.
I also don't care for the type and extent of the invocations. IMO there should be a few for every god:
Awe - Invoking the feeling of presence of the god
Blessing - Good fortune for the person being blessed, may or may not help.
There might be some more specifics here, but in general this is pretty well it. But blessing for instance - one can bless so that a wound heals, one can bless so that a weapon strikes, etc. etc.
The divine intervention rules I actually like better, they are not as set as to what exactly will happen, and the chance of sucess is not always great, but I feel this is more how a god should act.
The healing invocations - To me, the priests should be very well educated, and some of this takes the form of being educated has to how to heal in mundance ways. So the healing abilities of the priests should be good mundane skills, dpending upon god and sect - as well as the abilities to "bless" wounds to get them to heal better, and probably in some dieties priests the knowledge and having on hand proper herbal remedies.
But healing a hand back that has been amputated, completely healing someone who has been wounded almost unto death, bring soemone who has died back to life - IMO these should be handled through divine intervention, not invocations.
A Peonian hospital probably puts you in the best care available on Harn - They have high physician ML's, plenty of the proper herbs available, and will even bless your wounds to help them heal better - but beyond that you need divine intervention.
I also like the idea that in a blessing, the recipeint loses piety, not the priest - however, even of the recipient has no piety to donate, and is a "bad" person, Peoni above all may still try to bless the wound because it is her way. Larani and Agrik on the other hand would be less likely to heal someone that does not have some piety to their religion IMO.
Also, losing piety should be an occurrence if one does not follow the ways of the god - killing someone with a stab in the back would probably cause a loss of piety if a follower of Larani - Peoni might take someones piety points if they stand by and let innocents get slaughtered. I htink things like this should effect the ability of a cleric to perform invocations, and the ability of adherants to recieve these invocations, such as blessings.