I've mained a tier 5 RS cleric since forever and aura is decent but if you're looking for a replacement to the old EA mantle you will be dissapointed. It's not nearly that strong. And it is not an always on toggle, it's a spell that has to be recasted every couple minutes. It's still helpful for passive heals in legendary reapers if you push your positive spellpower and positive crit chance. It's not bad, just not amazing. You also get you and your party 20 second domain buff whenever you cast it, if they are in range of you.
I have been thinking of making a cleric myself and using the healing Aura from T5. but from what I've tested on a lvl 15 iconic Morninglord. It is quite Terrible. In fact i really think the Radiant Servant tree is quite bad compared to other tree's. Most other tree's when i use T5 are great in epics and are really a great way to improve your character. ill give a quick list what i think of the T5 separate Enhancements
Positive Energy Aura Not only is it really weak. But it is also using your turn undead charges, which is also used by Positive energy burst (which is far superior), Divine Healing which is better, Martyrdom which is great for when you die (not great on HC though lol) as it brings everyone close by up to full health, Reactive Healing (not sure about this one)
IMO divine healing does way too little healing to matter and Martyrdom is...honestly just awful because you shouldn't be dying lol. An ability that only works on death is basically just a flavor ability, not something that can ever be used seriously. I actually think it's cool from a flavor perspective but it should just be a passive benefit to one of the cores or something, or an inherent cleric ability, not its own ability you have to spend points on and therefore take on opportunity costs.
Radiance Never tested it. if it also heals. than its an amazing ability which makes taking T5 worth it. is it using undead charges. if so your back to the problem with Positive Energy Aura having to make sure you have plenty of charges and also turn dead recovery.
Radiance is very good and handy. Removes CC from all party members and gives Greater Restore, to anyone in the dungeon, regardless of distance.
Reactive Heal Never tested it, it sounds okay i suppose. but in Epics you can have people at 4k+ hp. so this ability would give back 6% hp which makes it sound dreadful lol
This is really bad because it only gives 250 HP which doesn't scale with spellpower. 250 HP is way too low for it to be any good at endgame. If it scaled in some way, it'd be different. But it doesn't.
Divine Energy Resistance This is a fantastic ability, but it really isn't a T5 ability. It makes buffing at the beginning alot quicker rather than using a lvl 2 resist energy spell for each individual element on each individual party member who needs it. The other thing is we are talking about Epics and guess what, anyone going into the Unyielding Sentinel Tree can get this on a tier 1 enhancement. Which really is a slap in the face of a radiant servant.
This is decent but you can also get it in Sentinel ED. Usually there are multiple people in the party who have it, making it a waste.
I am hoping some end game cleric players respond and explain why Cleric is so good. but i honestly feel that the cleric is now the worst dedicated healer class in the game.
I used to love running clerics and i hadn't run one in many years. So when i decided to test one (before i ran it on HC) I was extremely disappointed in it. Was trying all sorts of things to get it to work, but in the end decided to pick a different healing class which played and healed much better (I really hope SSG decide not to nerf the druid, we need to buff the cleric, not nerf the druid lol)
Looking forward to your answers 
Favored Soul is definitely the better healing class at endgame and higher difficulties because of healing wall and higher SP pools. Healing Wall is way better than Radiant Servant aura, by far, because of it being an AoE that can be cast safely from a distance instead of having to stand near those needing heals. Clerics do get no max caster levels on cure spells and a few other nice things like Radiance but FVS is definitely the way to go if you want to roll a focused healer type.
They should also rework Healing domain to make it worth using. Healbot clerics are much better off going Animal or Protection in all situations IMO.
I do wish they'd buff T5 radiant servant a bit. Aura and Radiant Servant Burst should both heal more and/or scale past level 20.
