
I am a Priest and have been playing this class since day 1 :3 I usually play the role of Full Healer, but since 5.0 I have taken on the role of DPS too
and Caster Healers can easily top the DPS meter. Now it's our turn to shine! 
These will be incredibly useful in PvP and particularly Dominion if you know how to use them well 
This is a wonderful change! The Unbridled Wrath rubies have also been changed so that they reduce the cooldown of Frenzy. At Rank 3 Frenzy has a 1 minute cooldown, but it is more like 30 seconds on average with the reduction from Unbridled Wrath. This change means our rotation has changed a little, and our DPS is boosted. No more waiting desperately for Frenzy to proc 
These should not be skipped as Heavenly Smite has been given a huge 75% increase to its damage. The more we can cast it, the better 
).
This is the build I am currently using.
You can skip the details about Talents and Rubies, however if you do read them you will actually understand the class much better and you'll be able to construct a suitable build for any situation. As the saying goes, give a man a fish and he'll eat for a day, but teach a man to fish and he'll eat for a lifetime 

This is your main DPS skill. This is the one you will spam most. These should both be Rank 3 in any Caster Build.
These are melee DPS skills and are not required in a Caster build. Skip them both and throw Verdict off your action bar.
This is a damage over time spell which will be important for increasing your overall Holy Damage. This should be Rank 2 or 3 if you have plenty of talent points.
A powerful single-target spell. Can be cast instantly by using Fanaticisms. This should always be Rank 3 in any Healer DPS build.
These are optional skills. I like Devoted Plea as it is a spammable heal with a low mana cost and no cooldown. I have Devoted Plea Rank 2 in my build.
This is one of the most important talents in the Healer's tree. This gives you access to the different Aspects. There are 3 Aspects.
Aspect of Light (Rank 1) - The Caster Aspect. Gives you a chance to receive Fanaticisms when casting Holy Blast/Celestial Judgement and stops them being interrupted by damage.
Aspect of Mercy (Rank 2) - The Healer Aspect. Gives you a chance to receive Fanaticisms when you or your party members receive damage. Allows you to cast certain heals without being interrupted and removes the cooldown from others.
Aspect of Rage (Rank 3) - The Melee Aspect. Gives you a chance to receive Fanaticisms when you use Verdict/Anathema and increases your Anger by 15.
You can take this to Rank 2 or 3. Smite is now massive damage, and with the Blessed Resolution rubies you can cast it every 10-15 seconds
As a bonus, it's an AoE and knocks your enemies down.
Holy Shield, aka Bubble, is an absolute life-saver. Don't skip Bubble! This will save your behind on multiple occasions. At Rank 3 it has a 3m cooldown, which can be reduced even further with rubies for PvP.
This skill is entirely optional. I have taken it because I like to have a few CCs in my builds. At Rank 2 the cooldown is 1m compared with 3m at Rank 1. It is useful for distracting mobs if you or an errant mage agro something by over-DPSing
If you are thinking about going into PvP, rank 2 or 3 is preferable.
This will be your main heal. It's a good periodic heal and you can boost it's crit rate and length with rubies. It is instant cast so you can just pop it on quick and get back to DPSing 
This is the AoE version of Particle of Light. It hops between enemies up to 5 times. This should always be rank 3.
Skip this. It's a melee attack that we have no use for.
This is an alternative option to Devoted Plea for a heal. It provides a bigger heal, however it costs a lot of mana, and has 50s cooldown in Aspect of Light. I prefer Devoted Plea as I can spam it as much as I need.
You should always take Rank 1 Purification minimum. Sometimes using a puri can save you mana on healing, or in the case of certain debuffs, stop you or your party being feared, poisoned, burnt alive, etc etc. At rank 1 it has a 10s cooldown. This is plenty as it's not your job to purify everyone. It is a personal/emergency puri.
I have chosen to take this as my big emergency heal. With fanaticism it can be cast instantly, however it does have a a 1 minute cooldown. I very rarely use it, so I have left it at rank 1.
Gives +15% to all magical damage done by you and your party, but cuts your healing by 50%. Good for PvE and should be rank 3. In PvP you can skip it as you will want as much healing as possible. Let the Mages give you it in PvP.
This is a control effect that looks good on paper, but is not so good in practice. It will periodically paralyse a target for a few seconds however this paralysis is broken by any damage. In PvE it is not a constant cc and would be broken by any AoE your group uses. In PvP there is too much AoE going around everywhere that the paralysis effect will also be constantly broken. It is not really worth putting any talents into.
This is very good burst damage, particularly useful on bigger mobs and bosses. It will apply stacks on the target that are removed when they receive damage. It will cause damage to enemies, and heal allies. This is a good skill due to the choice in heal/dps. When you are in a group, your groups damage will also cause the stacks to inflict damage to the target so the stacks will be consumed very fast with very little effort from you. This skill consumes Tears of Dragon. Higher quality tears will result in higher damage/healing. For DPS you should take this skill to Rank 3.
This is another optional skill. It is useful if you or that pesky mage agro again
It will provide protection for a short time, and knock the enemy down. It should give your healer a couple of seconds extra to heal you
It also consumes Tears of Dragon. This post has been edited 1 times, last edit by "Laela" (May 1st 2014, 4:57pm)

With all 4 (there are 3 in the Cleansing Flame grid too) it gives you +12 to Proficiency. An important stat ruby that should not be skipped in any build!
Increase the damage of Chain of Light and Particle of Light by 15%, but you won't be able to use them without Fanaticism. These rubies give a nice damage boost so don't skip them.
Increases the damage of all your Holy spells by 9%. This boosts all of the Caster's damage except for Heavenly Smite and Cleansing Flame. It also boosts all your Heals by 9%.
Reduces the mana cost of ALL your spells by 5/10/15%. I have only taken it at Rank 1 to use it as a bridge to Holy Flame. Although mana rubies are very useful, you will get more and more mana as your weapon improves and if you keep a good supply of mana pots and restoration potions then you should be fine for mana 
Gives 15% more damage to Holy Blast and Celestial Judgement. These are your main damage skills so this is a vital ruby, plus it leads the way to arguably the most important Caster ruby of them all, Frenzy.
This is by far the most important 3 rubies you can take as a Caster. For 8 seconds you will be able to instantly cast Holy Blast/Celestial Judgement, for 70% less mana cost.
Reduces the cast time of Holy Blast/Celestial Judgement by 30%. That's from 2s to 1.2s. It is a small difference, but when you are casting this spell almost constantly it does add up. These rubies are less vital though and may be dropped if you don't have so many rubies.
Increases the damage of Heavenly Smite and Chain of Light by 15% and stops them from being interrupted when you receive damage. Very useful rubies.
Increases the damage of Particle of Light by 18%. Another important ruby for any DPS build.
Increases the critical strike chance of Holy Blast/Celestial Judgement and Devoted Plea/Refreshing Light by 15%. In this patch, when we have only 5% Luck to start with, crit rubies make a big difference to your DPS.
While in combat you have a 25% chance to receive Unbridled Wrath every 2 seconds. These rubies are so important! They will cut the cooldown of Frenzy in half. These are an absolute must-have in a Caster build.
Each cast of Holy Blast/Celestial Judgement reduces the cooldown of Heavenly Smite by 3 seconds. Another ruby that people underestimate. With this ruby you can cast Smite, then Frenzy, and when Frenzy has finished (after 8s) your Smite will be ready again 
This ruby will boost your range up to 55 yards. You don't need this. Not in PvE anyway. On allods you never stand that far away from mobs, in raids there isn't normally that much room to stand 55 yards away, and when you're farming the mobs are in close range anyway. Plus you do not want to drift out of the range of your healer. For PvP these rubies may be useful as you will be able to kite outside of people's range, particularly as they cause Holy Blast, Celestial Judgement and Particle of Light to slow the target by 30%. However, for PvP with closer combat such as Dominion, you would be much better off taking defensive rubies as you will receive a lot of damage there.
Reduces the cooldown of Holy Shield, and the cooldown and mana cost of switching aspects. This is a very good ruby for PvP. Love your Bubble, it is your best friend in PvP. I skipped it as it is not so vital in PvE because you shouldn't be taking a lot of damage.
Increases your magic resistance and armour by 30% when your health drops below 50%. Another good one for PvP. Not essential in PvE.
Increases the chance to receive Fanaticism by 15%. More Fanaticism = more Particle/Chain of Light = more DPS 
NEW! This ruby previously only worked for Melee healer skills, but now it also applies to Caster's Holy Blast and Celestial Judgement!
It increases the damage of your Holy Blast and Celestial Judgement by 30% when your target's health drops below 30%. It also increases your Lightning damage by 9% (hello Heavenly Smite :3).
NEW! This was another Melee-only ruby. Now it will give a 25% chance to add extra Lightning damage to your Holy Blast and Celestial Judgement. This is not an essential ruby, but it can add a nice bit of extra damage. Take it if you have a lot of rubies.
This is another optional ruby. As I said previously, I like to have a few controls in my builds. Although I am normally healing in PvP, if I was to go in DPS build I would love to wreak havoc on my enemies in Dominion by fearing them all away from our flags every 40 seconds
To use this on other players you must take both Valiant Guardian rubies in the Cleansing Flame tree. Then just cast Holy Blast/Celestial Judgement on those players while in Aspect of Light, cast Exorcism and enjoy :3 *cue the evil laugh*
Increases your Vitality by 15. Useful for a HP boost in PvP, not essential for PvE.
Increases your healing received by 30% when your health drops below 50%. Only works in Aspect of Light and Aspect of Rage. Another good one for more survivability in PvP.
Another control effect. Silences the target for 6 seconds and prevents them from casting spells. Has a 1 minute cooldown. It's nice for PvP, not needed in PvE.
Reduces the cooldown of Binding Light, Hold in Contempt and Exorcism by 30%. Good if you like to use a lot of CC in PvP.
Each tick of Cleansing Flame has a 40% chance to apply 3 buffs on the target that increase the damage of a Holy attack by 15%. Almost all of your damage is Holy, so this is a big boost to your DPS. These buffs will keep stacking up and provide an almost constant 15% boost to your DPS.
Increases your Vigor by 9%. An important stat ruby for all builds.
Increases your Willpower by 8 and at rank 2 it will cause Holy Blast/Celestial Judgement to apply a mark on the target that will allow you to use Sacred Word and Exorcism on them. If you want Exorcism to work on players you must take both of these.
A nice backup heal for only 1 ruby. It can save your life from being 1 shot. If you have enough rubies, take it.
Each tick of Cleansing Flame has a 30% chance to apply Eternal Fire which renews the effect and increases its damage by 10%, stackable up to 5 times. It also increase the duration of Perpetual Healing (your main heal in Caster build) by 30%. This ruby will save you a lot of mana by not having to cast Cleansing Flame as often, as well as increasing the damage of the DoT that should be on your opponents for the entirety of combat by up to 50%. These are good rubies to take.
Increases your Determination by 3/6/9. I have taken it only rank 1 to reach Divine Infusion. For PvE you will not need Determination as you should be far from mobs and receive little damage normally. For PvP Determination is much more important and you should take all 3 of these rubies. I will go into more detail about the stats later on in the guide.
Increases the critical strike chance of Cleansing Flame and Perpetual healing by 10/20/30%. If I had one more ruby I would take this to Rank 3. Increased chance to crit makes a huge difference with the new stat system.

) We want to hit as much damage as possible on the first hit, so Proficiency will help us the most here.
Be prepared to hammer certain hotkeys, as Caster Healer is all about spamming Celestial Judgement. My rotation is as follows:
First make sure you have Aspect of Light active.
Start the fight with Cleansing Flame. This will begin to build
Blaze of Faith stacks that will boost your Holy Damage.
Use Heavenly Smite.
Activate Frenzy.
Spam Celestial Judgement. This will give you Fanaticisms and reduce the cooldown of Heavenly Smite.
Fanaticism, use
Particle of Light if single target, or
Chain of Light if multiple targets.
Heavenly Smite should be ready to cast again after Frenzy.
Providence for a nice burst.
.
Restores mana 3 times faster for 10 seconds. We use a lot of mana so this can be useful when your potions and Martyr skill is on cooldown. Particularly good for long boss fights and in raids.
Allows you to instantly teleport 25 meters forward. Good for kiting in PvP.
I hope this guide helps people to understand the new Caster Healer. If anyone wants any advice or tips on Caster or Healers in general (but not really Melee Healer), feel free to message me in game 

Taken from the fight with Sihal. The new Caster is OP! 
Nice guide. I was still uncertain about some rubies and what they do now since 5.0 ,but this helped me. Ty
I'm glad it helped.Awesome guide!I actually intended to make my reincarnation a caster healer and this seems quite helpful.It would be appreciated though if you can add a section for recommended rubies and talents and what to get first specially since you have kinda many rubies and also to make sure what to pick first while leveling.I understand one might understand priority talents and rubies through the description you made for every talent and ruby but I guess there would still be some confusion..Thanks!
I have updated it with a brief section on what to go for first.As a PvE build, the build suggested feels very suboptimal. Talent and ruby allocation should be amended to maximise the DPS.
Personally, Exorcism and the Willpower rubies (just to facilitate Exorcism and Sacred Word on mobs) are suboptimal in PvE. Yes, they have applications which can be useful but they are much more PvP focused skills.As a PvE build, the build suggested feels very suboptimal. Talent and ruby allocation should be amended to maximise the DPS.
Would you like to expand on this? I have maxed all the Caster DPS talents so I'm not sure how you can take more DPS from there, and I have only skipped 2 sets of rubies that would possibly boost damage. I skipped Inquisitor as it's a 9% boost only on those who use mana, which is very few creatures in PvE, and Surge of Faith as it will only boost Cleansing Flame by 15% which is nothing compared to the possible 50% boost of Eternal Fire or the 30% extra crit from Divine Infusion. How would you amend it for more DPS?

That is understandable. In which case, you may wish to state that in your guide and why you made such selections so people reading this do not feel it is the most optimal DPS Caster Healer build available?Thanks Welby and Windstorm
Shikari, unlike you, I don't have a Fountain of Death so that I can have a gajillion builds for every situation imaginable. This build is primarily for PvE, but it can cross over into PvP too, hence why I have taken the ccs. In PvP my role is normally full healer, but on the rare occasions where I do dps the extra cc is nice to have.
There is a leveling Caster Healer build hereAwesome guide!I actually intended to make my reincarnation a caster healer and this seems quite helpful.It would be appreciated though if you can add a section for recommended rubies and talents and what to get first specially since you have kinda many rubies and also to make sure what to pick first while leveling.I understand one might understand priority talents and rubies through the description you made for every talent and ruby but I guess there would still be some confusion..Thanks!
That is understandable. In which case, you may wish to state that in your guide and why you made such selections so people reading this do not feel it is the most optimal DPS Caster Healer build available?
Maybe you did and I missed it
Exorcism
This is another optional ruby. As I said previously, I like to have a few controls in my builds. Although I am normally healing in PvP, if I was to go in DPS build I would love to wreak havoc on my enemies in Dominion by fearing them all away from our flags every 40 seconds To use this on other players you must take both Valiant Guardian rubies in the Cleansing Flame tree. Then just cast Holy Blast/Celestial Judgement on those players while in Aspect of Light, cast Exorcism and enjoy :3 *cue the evil laugh*
Valiant Guardian
Increases your Willpower by 8 and at rank 2 it will cause Holy Blast/Celestial Judgement to apply a mark on the target that will allow you to use Sacred Word and Exorcism on them. If you want Exorcism to work on players you must take both of these.
Caster, CH, healer, Pimp my build, PMB