My longest post!
Andrew D. Gable said:
I'm working on a Crusades-era setting, and of course Christianity and diabolism come into play, so I'm trying to figure out what are Christian domains, and what are Satanic domains.
So I'll pose the question, how do you think the power levels of God and Satan measure up to each other?
An interesting twist on the subject, from the comics Arkel, is that God used to encompass all aspect of the universe.
It caused him problem, for whatever he created, he seeked to destroy it.
So he separated himself into two being: one good, and one evil, and fighted against himself to determine what aspect will rule over the universe, that when he cheated, cutting the right hand of the evil side, ensuring that he (it? she?) only will be able to create, he then put the evil side dormant into lucifer body.
This twist, only know to the most aged angel.
Anyway, usind De&De you could describe Satan with a DR16-20 and God with a DR21+, the missing salient abilities being those that allow to create. It would also explain why cleric can gain access to many domains.
I think Satan has a high DR from what most Divinity are able to do in the olympian pantheon, while still having a high DR (Zeus isn't a creator, he still has a DR19).
Also, when you build Satan, if you use European folklore, which has many stories where Satan is directly involved, give him some weakness, like no skill rank in sense motive (but still a high modifier due to a high charisma), he is sometimes tricked by others (though not as much as he tricks mortals).
So basicaly the exclusive domains would be good and repose for God, and evil and death for Satan.
On folklore, if you play in early crusade era, the inquisition hasn't even began, so the whole arcane magic=evil isn't well impregnated. By the way, I don't think it is relative to magic per se, but more with research (what magic is about, doing things that you can't do normaly), in early crusade era I would consider that character doesn't risk to be burned, though depending on the research (necromancy, etc..), character might infringe upon common taboo and being hanged for it.
Also, remeber that the Christian religion, didn't impregnated itself well everywhere, especially considering that in Brittany there is a nice procession every year that follow an old pagan road, with many magic stones (to get pregnant, etc...), sanctioned by the church (Local Heads of the church do it every 6 years). There is many thing like this in Europe (and have you seen how close holydays are to equinoxes and solstices), and legend on goblins and fey have been caried up to those day (think Arthurian Legend).
Many of the old gods have been translated into saint, the mother goddess for exemple has been translated into Anna the mother of Maria.
So the idea of having servant of some Saint getting access to domain perfectly fit the christianity, you could use a method like the one in the Iron Kingdom, you choose one domain among those of your god, and a second domain among those of your saint, considering that most temple are dedicated to a particular saint, you could have specific spell for some temple.
You could give them some DR, De&De advice on Devils & Demons Lord in a monotheist pantheon is to put them under DR 5, you could do the same for some archangel and saints.
That was assuming you wished to use the standard spell system, if you are more into something subtle, I advise on using the best subtle magic system: Four Color to Fantasy, No kidding, it could work!
Using those templates:
Good Servant
Like the Blaster, the Good Servant is sort of a sub-class of the Hero class, the Good Servant is a quick set of powers for you to choose if you are in a rush to create a character. Good Servants focus on doing good things to others.
Weak Good Servant
Primary Template Cost: 6 HrPs, minimum level 1.
Spare HrPs: 2.
Minor NPC or Monster Template Cost: 4 HrPs, min. level 1.
Skill bonus (2 HrPs): Mystical. Persistent. +3 bonus to heal check. Base rank 2.
Status Sense (4 HrPs): Mystical. Activated. As a standard action, you can touch a creature and know its status: unharmed, wounded, etc... Base rank 4.
Lesser Good Servant
Primary Template Cost: 34 HrPs, minimum level 5.
Spare HrPs: 6.
Minor NPC or Monster Template Cost: 19 HrPs, min. level 5.
Heal Wound (8 HrPs): Mystical. Activated. Once per day as a standard action you can convert 9 points of damage into subdual damage with a touch. Base rank 8. Increase effect x8 (8 ranks). Limited usage (8 HrPs reduction).
Immunity (4 HrPs): Mystical. Persistent. You are immune to non-magical disease. Base rank 4.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to eat. Base rank 1.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to drink. Base rank 1.
Shield (4 HrPs): Mystical. Activated. You can create a mystical shield in front of yourself, granting a +7 bonus to AC and a +3 bonus to Reflex saves against attacks coming from a choosen 180-degree arc. As a free action once per round you can reasign the angle of the arc. It disapear if you move out of its protection. Base rank 4.
Skill bonus (8 HrPs): Mystical. Persistent. +12 bonus to heal check. Base rank 2. Increased Effect x3 (6 ranks).
Status Sense (8 HrPs): Mystical. Activated. As a free action, you can touch a creature and know its status: unharmed, wounded, etc... You can know the status of up to 10 creatures per round. Base rank 4. Instant Sense (4 ranks).
Moderate Good Servant
Primary Template Cost: 60 HrPs, minimum level 10.
Spare HrPs: 20.
Minor NPC or Monster Template Cost: 45 HrPs, min. level 6.
Heal Wound (13 HrPs): Mystical. Activated. Once per day as a standard action you can convert 6 points of damage into subdual damage with a touch. Base rank 8. Increase effect x5 (5 ranks).
Immunity (4 HrPs): Mystical. Persistent. You are immune to non-magical disease. Base rank 4.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to eat. Base rank 1.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to drink. Base rank 1.
Shield (12 HrPs): Mystical. Activated. You can create a mystical shield in front of yourself, granting a +7 bonus to AC and a +3 bonus to Reflex saves against attacks coming from a choosen arc up to 360-degree. As a free action once per round you can reasign the angle of the arc. It disapear if you move out of its protection. Base rank 4. Full arc (8 ranks).
Skill bonus (8 HrPs): Mystical. Persistent. +12 bonus to heal check. Base rank 2. Increased Effect x3 (6 ranks).
Status Sense (12 HrPs): Mystical. Activated. As a free action, you can know the status of a creature within 50 ft.: unharmed, wounded, etc... You can know the status of up to 10 creatures per round. Base rank 4. Instant Sense (4 ranks). Ranged Sense (4 ranks).
Telepathic Charm (9 HrPs): Mystical. Activated. You can charm those that meet your eyes, those that fail their save are charmed for 1day/level. Base rank 10. Incresed Duration (1 ranks). Eyes contact (2 HrPs reduction).
Greater Good Servant
Primary Template Cost: 109 HrPs, minimum level 20.
Spare HrPs: 51.
Minor NPC or Monster Template Cost: 87 HrPs, min. level 20.
Control Water (10 HrPs): Mystical. Activated. This function as the spell of the same name. Base rank 10.
Control Weather (12 HrPs): Mystical. Activated. This function as the spell of the same name in a two-miles radius. Base rank 8. Greater Weather Control (4 ranks).
Heal Wound (23 HrPs): Mystical. Activated. Once per day as a standard action you can convert 10 points of damage into subdual damage with a touch, or within close range, or to all creture in a 10ft. radius burst. Base rank 8. Increase effect x9 (9 ranks). Ranged Healing (2 ranks). Burst Healing (4 ranks)
Immunity (4 HrPs): Mystical. Persistent. You are immune to non-magical disease. Base rank 4.
Inexhaustible Endurance (4 HrPs): Mystical. Persistent. You always succeed Constitution checks related to effort of endurance. Base rank 4.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to eat. Base rank 1.
Self-Subsistent (1 HrPs): Mystical. Persistent. You do not need to drink. Base rank 1.
Shield (17 HrPs): Mystical. Activated. You can create a mystical shield in front of yourself, granting a +7 bonus to AC and a +3 bonus to Reflex saves against attacks coming from a choosen arc up to 360-degree. As a free action once per round you can reasign the angle of the arc, or you could have your shield block all physical attack trough it. It disapear if you move out of its protection. Base rank 4. Full Arc (8 ranks). Full shield (5 ranks).
Skill bonus (8 HrPs): Mystical. Persistent. +12 bonus to heal check. Base rank 2. Increased Effect x3 (6 ranks).
Status Sense (20 HrPs): Mystical. Activated. As a free action, you can know the status of a creature within 50 ft.: unharmed, wounded, etc... You also learn the creature current number of hit point, unless they make a will save. You can know the status of up to 10 creatures per round. Base rank 4. Instant Sense (4 ranks). Ranged Sense (4 ranks). Accurate Sense (8 ranks).
Telepathic Charm (9 HrPs): Mystical. Activated. You can charm those that meet your eyes, those that fail their save are charmed for 1day/level. Base rank 10. Incresed Duration (1 ranks). Eyes contact (2 HrPs reduction).
Evil Servant
Like the Blaster, the Evil Servant is sort of a sub-class of the Hero class, the Evil Servant is a quick set of powers for you to choose if you are in a rush to create a character. Evil Servants focus on doing bad things to others.
Weak Evil Servant
Primary Template Cost: 7 HrPs, minimum level 1.
Spare HrPs: 1.
Minor NPC or Monster Template Cost: 6 HrPs, min. level 1.
Heightened Accuracy (3 HrPs): Mystical. Persistent. +2 accuracy bonus to attack rolls. Base rank 1. Increased Accuracy (2 rank)
Improved Weaponry (3 HrPs): Mystical. Persistent. +2 damage with the weapon of your choice. Base rank 3.
Super Strike (1 HrPs): Mystical. Persistent. Your attack can harm creatures with damage reduction as if you were attacking with a +1 weapon. Base rank 1.
Lesser Evil Servant
Primary Template Cost: 28 HrPs, minimum level 5.
Spare HrPs: 12.
Minor NPC or Monster Template Cost: 22 HrPs, min. level 5.
Enhanced Vision (4 HrPs): Mystical. Persistent. You have low-light vision and darkvision 60 ft. .Bas rank 2. Darkvision (2 ranks).
Heightened Accuracy (3 HrPs): Mystical. Persistent. +2 accuracy bonus to attack rolls. Base rank 1. Increased Accuracy (2 rank)
Improved Weaponry (3 HrPs): Mystical. Persistent. +2 damage with the weapon of your choice. Base rank 3.
Poison (8 HrPs): Mystical. Persistent. Whenever you deal unarmed damage to an opponent, it must make a fort save or suffer 2 Wisdom damage. One minute later he must make a second save or take 1 Wisdom damage. DC 14. Base rank 6. Increased Primary Damage (2 ranks).
Super Strike (5 HrPs): Mystical. Persistent. Your attack can harm creatures with damage reduction as if you were attacking with a +3 weapon. Base rank 1. Increased Effect x2 (4 ranks).
Telepathic Communication (5 HrPs): Mystical. Persistent. You can send silent message to someone in your line of sight up to close range. Base rank 5.
Moderate Evil Servant
Primary Template Cost: 66 HrPs, minimum level 10.
Spare HrPs: 14.
Minor NPC or Monster Template Cost: 53 HrPs, min. level 10.
Enhanced Vision (4 HrPs): Mystical. Persistent. You have low-light vision and darkvision 60 ft. .Bas rank 2. Darkvision (2 ranks).
Heightened Accuracy (7 HrPs): Mystical. Persistent. +4 accuracy bonus to attack rolls. Base rank 1. Increased Accuracy x3 (6 rank)
Improved Weaponry (3 HrPs): Mystical. Persistent. +2 damage with the weapon of your choice. Base rank 3.
Poison (12 HrPs): Mystical. Persistent. Whenever you deal damage to an opponent through armed or unarmed attack, it must make a fort save or suffer 2 Wisdom damage. One minute later he must make a second save or take 1 Wisdom damage. DC 14. Base rank 6. Poisonlace (4 ranks). Increased Primary Damage (2 ranks).
Super Strike (7 HrPs): Mystical. Persistent. Your attack can harm creatures with damage reduction as if you were attacking with a +4 weapon. Base rank 1. Increased Effect x3 (6 ranks).
Telepathic Charm (13 HrPs): Mystical. Persistent. You can telepathically dominate a humanoid in your line of sight up to close range. Base rank 10. Domination (3 ranks).
Telepathic Communication (7 HrPs): Mystical. Persistent. You can send silent message to someone in your line of thought up to close range. Base rank 5. Line of thought (2 ranks).
Telepathic Scan (13 HrPs): Mystical. Persistent. You can detect the surface thought of any creatures you are aware of up to close range. Base rank 11. Line of thought (2 ranks).
Greater Evil Servant
Primary Template Cost: 98 HrPs, minimum level 19.
Spare HrPs: 54.
Minor NPC or Monster Template Cost: 85 HrPs, min. level 19.
Enhanced Vision (4 HrPs): Mystical. Persistent. You have low-light vision and darkvision 60 ft. .Bas rank 2. Darkvision (2 ranks).
Heightened Accuracy (17 HrPs): Mystical. Persistent. +9 accuracy bonus to attack rolls. Base rank 1. Increased Accuracy x8 (16 rank)
Improved Weaponry (3 HrPs): Mystical. Persistent. +2 damage with the weapon of your choice. Base rank 3.
Poison (22 HrPs): Mystical. Persistent. Whenever you deal damage to an opponent through armed or unarmed attack, it must make a fort save or suffer 7 Wisdom damage. One minute later he must make a second save or take 1 Wisdom damage. DC 14. Base rank 6. Poisonlace (4 ranks). Increased Primary Damage x6 (12 ranks).
Super Strike (9 HrPs): Mystical. Persistent. Your attack can harm creatures with damage reduction as if you were attacking with a +5 weapon. Base rank 1. Increased Effect x4 (8 ranks).
Telepathic Charm (17 HrPs): Mystical. Persistent. You can telepathically dominate a humanoid in your line of sight up to close range. Base rank 10. Domination (3 ranks). Linked Power Telepathic Communication, Telepathic Scan (3 ranks). Increased Duration (1 ranks).
Telepathic Communication (10 HrPs): Mystical. Persistent. You can send silent message to someone in your line of thought up to close range. Base rank 5. Line of thought (2 ranks). Linked Power Telepathic Charm, Telepathic Scan (3 ranks).
Telepathic Scan (16 HrPs): Mystical. Persistent. You can detect the surface thought of any creatures you are aware of up to close range. Base rank 11. Line of thought (2 ranks). Linked Power Telepathic Communication, Telepathic Charm (3 ranks).
Then you'll use the Spare Hero Point to get hit points and/or power specific to your saint patron.
N.B. you have the Deities&Demigods book, don't you?
also, you might be interested in this book:
http://www.enworld.org/d20reviews.asp?sub=yes&where=currentprod&which=cov6