eamon said:
I don't think the requirements posted are sufficient since they allow all sorts of combos which I can't oversee; merely that it's OK in principle, with sufficiently narrow requirements which make it unattractive for other PCs. In particular, it should only apply to clerics, and should cost effectively cost two feats.
My analysis depends on Sudden persist effectively consuming 2 feat slots.
OK.
The BAB bonus is the biggest part of divine power, which is why I focussed on it. The hitpoints aren't much more useful when persisted than when not (they can't be healed between encounters).
But it's still useful because if you persist it it's guaranteed to be there in the first encounter you do have - as opposed to casting false life and then having it fade away because you end up not fighting.
The strength bonus doesn't stack with many things, but is of course useful. However, it's unlikely to tip the cleric over the border of being stronger than the fighter, who will have some other source of strength enhancement, especially as levels rise.
But it's free (or rather, the cost is paid by the feat slots.) The fighter is spending 16k gp or more for his strength bonus.
I find the power creep differential between 1/day and 1/encounter to be small.
We disagree on this. There are a lot of "nova" builds - yes, including cleric nova builds - that would go from "useful in a party" to "utterly able to kill everything in the campaign and not break a sweat" if changed from 1/day to 1/encounter. The persistent buff cleric takes those resources and instead turns them into long-lasting buff spells. If you would not multiply the nova cleric's resources, you cannot in good faith multiply the buff cleric's.
Wraithstrike is one of those spells worst in the hand of a two-handed power-attacker, which doesn't need any more boosting as is. It's definitely more powerful when used against PC's than when by them, but still, I'd keep it far away from any game I'm in if possible. It's worse than save-or-die, since you usually don't get a save, and many people don't have a defense against it (or don't have that defense "on" until it's too late) - and it's easily lethal in many cases. And wraithstrike+powerattack gets worse at higher levels.
Yes, but I fail to see your point. See, close combat almost always goes for the PCs and against the enemy at high levels - even dragons need to be wary, as entering close combat is statistically a losing proposition for them unless done under certain circumstances. Wraithstrike is a great equalizer that once again makes all those intelligent, formidable melee monsters no laughing matter. YMMV, but it's been fine in my campaigns.
Oh, and note that it has a "S" component - there is a ruling in many campaigns that you can't use it and 2h power attack in the same round, because you need to gesture. Hyp went into this with a nice article on the distinction between "wielding" and "holding" and a look into whether putting your hand back on the sword should be allowed.
As to why only a cleric should use Sudden Persist: I don't have a problem with boosting other classes, but Sudden Persist simply adds the least risk to a cleric. DMM clerics have been persisting for a while, and the errata's have fixed many egregarious problem spells. The remaining persistable spells for the cleric aren't that brilliant. Righteous Wrath of the Faithful is one of the better ones, as is Divine Power. Other classes haven't had that vetting. A druid using the Bite of... spells is scary.
The druid can take a level in cleric and then get the Sudden Persist Feat. Whereas, if he needs to use DMM

, he can still do it with a level in cleric, but now he needs to worry about high charisma as well.
Perhaps other classes would be balanced, I'm just more sure that a cleric is, since I've seen that in play, and it wasn't overshadowing the rest of the party.
A cleric not overshadowing the party is just a cleric being played nicely. I don't doubt your experiences, but they don't match up with mine in terms of a cleric's ultimate potential for abuse (which is what we're discussing here.)
So really, this comes down to that persist just isn't that broken when you can't use it often, especially for a cleric.
It isn't the most broken thing in existence, but compared to feats like Toughness or Diehard, one must agree that it sets a new power curve.