Enlightened Spirits in the pen-and-paper 3.5e (Complete Mage, page 60) get both of these abilities at level 1 as class features, which is the primary reason for their inclusion.
Pets/hirelings do have some AI issues that we're still working on. As for the Survivability/DPS end of things... that's a good argument for why abilities like this
should be included.
They won't improve if we don't add things to improve them.
We're still working on the balance, and if it's not good enough at low levels, or too good at high levels, we'll make adjustments; it's hard to say for sure until we get some builds running around with it. That said... it
should do a lot more damage at 18 than, and a lot more at 10 than 5. We still want it to be viable for Multiclass Warlocks (who won't get as many Pact dice but will still scale with Spell Power), but it should shine on Pure/mainline Warlocks.
It may be too big. This ability came in to replace something else after Player's Council feedback, relatively close to this post. We'll take a look.
It has a small SP cost, but Warlocks do not get access to the Cure spells in their spell list, and the only other Healing abilities Warlocks get in their trees have extensive cooldowns. This one is fast.
This tree has a small Spell Power line in Power of Enlightenment, where you can get 30 (Light or Positive) plus 12 Universal Spell Power. If that, combined with other sources of Spell Power, still leaves Warlocks underpowered we'll look into adding some other sources in the trees.
Still subject to change, but right now it's about the same size as Death Aura, or any other "Standard" AOE - ~5 meters.
The main reason
is actually build diversity. For a lot of melees who splash into Warlock to get the aspects of this tree, the Aura alone is going to be a somewhat substantial bump in DPS. Tying these two abilities to the cooldown of Cleave means characters in this tree fall into one of three categories:
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Cleave/Great Cleave is stronger than Eldritch Burst/Spirit Blast. This will probably be true for low-level splashes and multiclasses with low Spell Power (but a lot of item effects), like Fighters. In that case, keep using Cleaves.
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Eldritch Burst/Spirit Blast is stronger than Cleave/Great Cleave. If you're a pure Warlock, or multiclassed something martial with a lot of spell power (a melee Arti, or an Eldritch Knight), this will probably be true. In this case, you may want to use Eldritch Burst/Spirit Blast instead of Cleave/Great Cleave.
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You're playing a character that couldn't use Cleave/Great Cleave anyway. Like a bow user, or pure caster that dumped STR. Hey, this choice is easy! Take EB/SB if you think you'll have enemies in that range often, or just ignore the line.
Essentially, the point is to encourage different styles for different kinds of characters, so the right choice isn't *always* to take *both* this line and the Cleave line for Melee Warlocks. Cleave builds are really good right now (lookin' at you, Barbarians) - This is an alternative, and it doesn't cost two Feat slots.
I may be wrong (please correct me if I am), but I believe you can get more PRR and MRR out of this Enhancement Tree than any other Enhancement Tree in the game... Standing still and wearing Medium armor, you get 19 PRR and 29 MRR out of this tree, which goes up to 39 PRR and 49 MRR when you get Spirit Armor fully running.
(Note: I noticed that Spiritual Bastion and Spiritual Ward don't say that you also get the Allies portion yourself. Right now, you do. We'll fix the wording.) That's on top of your armor and any other external sources, plus you're buffing your friends' PRR/MRR as well. If we switched it to a static bonus, it'd be a smaller bonus, and a lot less interesting. Nobody likes getting hit, but if you can survive a few seconds of it, you'll be good for the fight.