51 Cabalist/14 Justicar/1 Sentinel offers extremely high average dps throughout an Expert or Master dungeon, while passively and directly healing the group as needed. It is recommended to run this over a primary healing spec such as Senticar or Puri/sent since experts and master modes do not require much direct healing. Also, if you are aiming for record speedclears, this would be the healing spec of choice.
Buffs and skills to have on your bar
**Active Buffs - Mien of Honor, Reparation, Dark Harbor, Righteous Mandate (applied to your tank), Howling Death (applied during down-time)
**Damaging abilities: Tyranny macro (provided below), Ravaging Darkness, Bound Fate, Shadow's Touch, Curse of Solitude, Bolt of Radiance, Light Bolt, Sign of Asias macro, and the Single-target macro (provided below)
**Healing abilities : Doctrine of Loyalty, Healing Breath
**Utility abilities: Dark passage, Reversal of Fortune, Sigil of Woe, Sigil of Secrecy, Break Free, and the Mana macro (provided below)
cast curse of discord
cast dark water
cast distorted shadows
cast shadow's touch
cast Bolt of Radiance
cast strike of judgment
cast Vile Power
cast Strike of Judgment
**Sign of Asias macro:
#show sign of asias
cast sign of asias
cast vile power
**One target: Use the Single-target macro
**Two targets: Use Tyranny whenever you have three decays, and always after two Shadow's Touch casts.
Example: Tyranny, Shadow's Touch, Shadow's Touch, Tyranny, Shadow's Touch, Shadow's Touch..
**Three Targets+: Use Tyranny whenever you have three decays, always after two Bound Fate or Shadow's Touch casts, and prioritize Bound Fate over Shadow's Touch. Feel free to throw in Curse of Solitude if you feel the mobs will be alive for the duration of the DoT.
Example: Tyranny, Bound Fate, Shadow's Touch, Tyranny, Shadow's Touch, Bound Fate, Tyranny
Obviously if a cast-time ability will not complete, you are better off with another Tyranny.
To re-iterate: Cabicar is intended as a healer for Experts and Master mode dungeons. There is no other support healing or otherwise that is necessary.
As a rule of thumb, you want to maintain four convictions at all times. As good as Cabicar is at passively healing your group, passive healing isn't always the best choice. Convictions are maintained with Bolt of Radiance and Light Bolt. Usually Bolt of Radiance is plenty to maintain your convictions, but there may be times where you need them ASAP, in which case you use Light Bolt.
Your tank is healed passively through Reparation and Righteous Mandate. For boss fights or situations where your passive healing isn't enough, you may want to use Healing Breath on cooldown, particularly in a Master mode dungeon.
Remember your utility! If the tank gets out of range you may use Dark Passage to teleport forward a bit. You have access to an aoe silence for stray casters and a purge for certain boss fights and mobs in mmCR (Storm Burst!). You have a reflect (Reversal of Fortune) which is really handy because you will usually gain aggro on mobs at least once per dungeon. Save it for a very high damage skill, either Cinder Burst or Lightning Strike. Use the "mana macro" in the emergency where you've somehow been drained of your mana.
Save Sign of Asias for a situation where the mobs absolutely must die. This is usually if you've accidentally pulled an entire set before the tank even has them targeted, or if the tank has lost aggro and multiple mobs are killing party members. Sign of Asias + Tyranny unleashes a ridiculous amount of damage and healing. Ravaging Darkness can also save your life if you take a nasty crit.
Important Note!!!: you do not have any cleanse as a Cabicar, so you must heal through any mechanics that are normally cleansed (such as Rictus' Rotting Flesh or the disease from Majolic the Bloodwalker; for fights like these it is imperative you maintain four convictions at all times)
I have a few low-quality videos of me playing Cabicar on my Twitch channel; here is one of them.
As always, feel free to ask questions. My guide has covered the main points and a few obscure ones as well, but I feel there is still room to improve.