Someone
Adventurer
Felon said:The big flaw in this analogy is that the Tempest does not in fact gain access to fighter feats as it progresses, whereas the RSoP continues to gain cleric spell progression. The tempest loses access to the fighter's primary class feature, while the RSoP doesn't.
Of course it's not exactly the same, of else it wouldn't be an analogy. The point stands, however; once you have the requisites, and you want to improve your TWF you'd better taking tempest levels instead of Fighter levels.
This is a problem that PrC's oriented towards clerics and sorcerers have. They have no class features to surrender other than spellcasting progression. Give the PrC full spellcasting progression, and it gets the full benefit of the base class. All you can do to compensate is either lower BAB & HD, or stiffen up the requirements so the class has to sacrifice feats (sacrificing skill points is a minor consideration for clerics & wizards)
On a side note, the tempest is not even a particularly powerful two-weapon fighter build. It's just an interesting variant. Spring Attack and Mobility do not synergize with two-weapon fighting until the tempest hits 5th-level and gets the capstone ability, and even that is rather mild. If one has access to PHBII, Complete Warrior, and Complete Adventurer feats, then taking fighter levels is probably a better power-play.
I hope you're kidding there, but still. From this and other posts I'm deducting that the problem isn't really with the radiant servant, but the cleric class. We should level that to the "most broken base clases", not the "most broken prestige classes"