Yeah, EyeontheMountain, my query on the Pious Templar and the Initiate of the 7-fold Veil went unanswered in this landslide of Radiant Servant business.
Ah well, may as well wade on in...
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We can all agree that the Radiant Servant of Pelor does two things well:
Heals
Turns Undead
It does not seem insignifigant to me that the class is called "Radiant Servant
of Pelor", as Pelor is a god of healing and of the Sun, which is anathema to undead. The two greatest restrictions of this class are: patron Deity and alignment. If your character concept is that of a wicked cool fighting cleric of WeeJas who is also good at healing, too bad. It means that the best healers in the world are Pelorians, and that makes sense. It means that the best fighters against undead are Pelorians, and that makes sense.
The question of "why wouldn't any cleric take this class?" is an erronious question. Any cleric wouldn't take this class because
only clerics of Pelor qualify.
The real question is "why wouldn't a cleric of Pelor take this class?" And the answer is, "Every cleric of Pelor probably would take this class". Is that such a bad thing to have the Healing and Sun god running around with healing and undead-turning clerics?
Only if the choice of alignment, deity and domans means nothing to you can you delcare that this is not a signifigant restriction on the character. And if you believe that the choice of alignment, patron deities and domains means nothing, then there's nothing further to discuss.
Second point:
Turning undead is an ability completely in control of the DM. It can be powered up by encountering more undead, mitigated by applying Turn Resistance, and almost completely obsoleted by not throwing undead at the PCs. If the Radiant Servant is becoming a little powerful, let the intelligent undead actually get smart and stay out of this guy's way.
Point the Third
Healing is a defensive ability (though it can be offensive against undead: see second point). Offensive abilities are valued higher than defensive ones as far as balance goes: after all, you have to attack the Radiant Servant for him to get mileage out of his increased healing capability. Like the Initiate of the 7-fold Veil, increasing the power of a defensive ability will not necessarily increase the character's offensive power as much as it will increase his party-members' survivability: increases in defensive abilities work to increase the other party members' offensive capabilities. It is immenently not imbalancing, nor broken, to broadly increase your party's survivability.
Point the 3.5:
Also, the text says, "casts a domain spell from the healing domain". The footnote for the cleric table on page 31 of the PHB states:
In addition to the stated number of spells per day for 1st through 9th level spells, a cleric gets a domain spell for each spell level, starting at 1st. The "+1" in the entries on this table represents that spell. Domain spells are in addition to any bonus spells the cleric may recieve for having a high Wisdom score.
[Emphasis added]
This footnote does clearly seperate domain spells from the other spells the cleric may cast from their spell list and those gained from a high Wisdom.
For those of you who argue both that the Radiant Servant is too powerful and that the Empower Healing ability can be used with every Healing spell cast, here is precident that allows you to rule otherwise. Refusing to use this ruling that would allow you to power-down the abilities of a class you claim to be over-powered may suggest that perhaps you dislike the class for other reasons than its power-level, and simply use power-level as an excuse to ban the class.