Current Cleric Capstone is...
Cleric Divine Intervention: You can expend a turn attempt to ward your target for five minutes against mortal damage, hit point damage will not lower target hit point total below -9. If the target is knocked unconscious, this effect will heal the target after a few seconds for 10 to 39 hit points and then fade.
Which seems a lot like Rogue's Original Capstone:
Rogue Cheat Death: +2 dexterity and a chance of self-resurrection, but this chance drops each time you die and Maruts dislike you.
Which was deemed garbage and then this was offered...
Rogue Deadly Shadow: +2 intelligence and 4 additional sneak attack dice.
Can Cleric's be offered something similar to Wizard's Capstone?
Wizard Master of Magic: Grants +2 Intelligence and all metamagics you possess cost 1 fewer spell point to use. (Heighten Spell costs 1 fewer spell point per level of heightening.)
Instead of INT, obviously give us Wisdom?
Or heck give us a Capstone that gives us like...
2 More Turn Attempts and a Stacking 15 Spell Power on Healing and Smiting Spells
As of now...I just cannot see why you would ever go pure Cleric.
Builds I see a lot now...
All of those builds listed above will do more Melee DPS...and the Clonk will actually have a higher DC due to Ocean Stance (in addition to Evasion)