Your healing is made up two types of healing: Temporary Hit Points and Positive Healing
Temporary Hit Points is something usable by all classes, but Warlock has a wider set of temporary hit point options than most builds. Temporary hit points is a very solid self-healing mechanism in reaper because it's not affected by the reaper self-healing penalty which is roughly 60% + 4% per skull. Self-healing is the most penalized thing in all of reaper.
TEMPORARY HIT POINTS
Your temporary hit point options as a warlock are:
- Feigned Health from Tainted Scholar Tier 1
- Brilliance from Enlightened Spirit Tier 4
- Rejuvenation Cocoon from Primal Avatar Destiny Tier 1
- Shining Through from Enlightened Spirit Tier 5
- Stanch from the first core of Tainted Scholar
- Legendary Greensteel triple positive off-hand weapon or Staff of the Summer Solstice
These options all stack with each other and are boosted from different sources (e.g., Feigned Health is boosted by charisma, shining through is boosted by constitution).
As an example rejuvenation cocoon is a positive healing spell, but has an often overlooked bonus of granting 150 temporary hit points. The positive healing will be reduced each skull in reaper and will yield very little positive healing at R10. However, the 150 temporary hit points doesn't scale with reaper and is boosted by feigned health. So if you have cast rejuvenation cocoon on yourself in R1 you will get nearly 250 temporary hit points (150 + your charisma score) and the spell will provide a decent amount of healing. In R10 the same spell will get you nearly 250 temporary hit points but the effect of the positive healing will be very small. Rejuvenation Cocoon has a 12 second cooldown.
Brilliance is part of the enlightened spirit aura so it is is continually resplenishing every 2 seconds. This passive temporary hit point regeneration is very helpful during fights.
Shining Through grants around 500 hp to this build and has a 30 second cooldown.
Stanch should be used more carefully as every use lowers your hit points by 3%, but it also grants you a temporary hit point bonus equal to 50% of your hit points. It requires getting charged up with depravity, but I've found that when I needed to use it - it was always properly charged up. If you think you might die click stanch for a big temporary hit point boost.
Using legendary greensteel triple positive or staff of the summer solstice isn't necessary, but for some encounters the extra hp can be beneficial. As an example I use triple positive at the beginning of the bear fight in dryad and the demigod until I get the 1000 temporary hit point proc and then switch off hands since I have taken some big damage #s in that fight in the past.
Unlike regular healing, temporary hit points can be used proactively. For example, if you cast rejuvenation cocoon and shining through on yourself before a fight, that will give you over 800 bonus hp.
At lower heroic levels the combination of the false life spell + feigned health is very effective self healing. Once the combination is no longer useful, swap out false life for another spell. You can also use potions (cure serious potions) from the guild potion vendor at low heroic levels.
POSITIVE HEALING
Positive healing is boosted by spellpower (or wand and scroll mastery for scrolls) and healing amplification. The effects of these are multiplicative so you should try and maximize both. There is a significant amount of healing amplification available in Exalted Angel. Here is a good article on healing amplification:
https://ddowiki.com/page/Healing_Amplification
At heroic levels you will primarily be using wands and scrolls. Once you hit level 9 I find the heal scroll to be the most effective method of positive healing.
For epic levels you have
- Rejuvenation Cocoon from Primal Avatar Destiny tier 1
- Mass Cure Moderate SLA from Exalted Angel cores
- Divine Wrath SLA from Exalted Angel Tier 5
You main heal spell will be the mass cure moderate spell which has a 9 second cooldown and can be boosted with maximize and empower with no extra spell point cost. Mass cure moderate also benefits from feigned health temporary hit points.
Rejuvenation is your secondary spell having a 12 second cooldown, but also having the extra 150 temporary hit point boost.
Divine wrath is an offensive spell but provides healing and I usually throw is over myself during fights.
Scroll healing is good at heroic levels, but I tend not to use it at epic levels except to restore stat damage.
I've not found hirelings useful during fights, but having one parked you can use as a recharge button between fights can be helpful.
This is not required, but for completeness I will mention having a dual box bard with sustaining song gives you outstanding healing over time that isn't penalized in reaper and compliments brilliance really well. The dual box bard can also raise you if you die.
Since this build uses flamecleansed fury set, it comes with hallowed castigators which gives healing lore and healing spellpower. It also includes armor that grants healing amplification.
Please let me know if you have any questions.