Understanding Echo Of Light

14 Mar

One of the greatest debates happening on a number of forums regarding priests is the question of haste versus mastery, in terms of what attributes we should be stacking.  While we are all no strangers to haste and how important it was to us in previous expansions, mastery is something new that may not be entirely understood or appreciated yet.

There are a few pages already out there that do a magnificent job of explaining what our mastery is and how it operates, but I really wanted to try and sum everything up in a more easier to understand format to hopefully summarize what other sites may have mentioned and maybe include a few things that they didn’t cover.

What is the holy priest mastery?

Our mastery is called Echo of Light and it allows each direct heal that you cast on someone to heal them for an additional 16% over 6 seconds.  Each additional point of mastery that you have will increase the size of this heal by an extra 1.25%  The heal over time portion of Echo of Light ticks 6 times or once per second.  This does not appear to be affected by your critical strike or haste rating.

What spells/effects will proc Echo of Light?

Binding Heal
Circle of Healing
Desperate Prayer
Divine Hymn
Flash Heal
Glyph of Power Word: Shield
Greater Heal
Guardian Spirit
Heal
Holy Nova
Lifeblood
Prayer of Healing
Prayer of Mending
Renew
Holy Word: Sanctuary
Holy Word: Serenity

Using a healing potion will also trigger Echo of Light, regardless of how much health you regained from it

How does Echo of Light work?

Any time that you cast one of the above mentioned heals or healing effects on someone, Echo of Light will leave behind a heal over time effect on them for 16% of how much that ability healed them for.  For example:

Obscene’s Flash Heal heals Obscene for 16471
Obscene gains 455 health from Obscene’s Echo of Light
Obscene gains 455 health from Obscene’s Echo of Light
Obscene gains 455 health from Obscene’s Echo of Light
Obscene gains 454 health from Obscene’s Echo of Light
Obscene gains 455 health from Obscene’s Echo of Light
Obscene gains 455 health from Obscene’s Echo of Light

Admittedly, that doesn’t sound like a lot.  Where Echo of Light really shines is with abilities that heal more than one person, like Circle of Healing and Prayer of Healing.  Having numerous people receive an additional heal over time on them after you heal them is pretty nice and makes a difference on fights with heavy AOE damage.  People standing in the effects of Holy Word: Sanctuary will also receive heals from Echo of Light and it will refresh itself as the person stands inside of it and for as long as the healing zone is generating heals.

Obscene’s Holy Word: Sanctuary heals Obscene for 680
Obscene gains 19 Health from Obscene’s Echo of Light
Obscene’s Holy Word: Sanctuary heals Obscene for 674
Obscene gains 19 Health from Obscene’s Echo of Light
Obscene’s Echo of Light is refreshed on Obscene
Obscene gains 28 Health from Obscene’s Echo of Light
Obscene’s Holy Word: Sanctuary heals Obscene for 621
Obscene gains 28 Health from Obscene’s Echo of Light
Obscene’s Echo of Light is refreshed on Obscene

This brings up a very good point and the next thing I will talk about.

How does Echo of Light refresh itself?

At first glance, it’s easy to think that the heal over time placed by Echo of Light from a larger heal will be clipped by one from a smaller heal and then the overall effectiveness will be reduced.  I used to think this way, too.  Luckily, Echo of Light works in such a way where the overall HPS does not change because of this and will still provide a consistent amount of healing.  Let’s say that I cast Greater Heal on myself and then Heal shortly after it.

Obscene’s Greater Heal heals Obscene for 21408
Obscene gains Obscene’s Echo of Light
Obscene gains 592 Health from Obscene’s Echo of Light
Obscene gains 592 Health from Obscene’s Echo of Light
Obscene’s Heal heals Obscene for 8026
Obscene’s Echo of Light is refreshed on Obscene
Obscene gains 517 Health from Obscene’s Echo of Light
Obscene gains 517 Health from Obscene’s Echo of Light
Obscene gains 517 Health from Obscene’s Echo of Light
Obscene gains 517 Health from Obscene’s Echo of Light
Obscene gains 518 Health from Obscene’s Echo of Light
Obscene gains 517 Health from Obscene’s Echo of Light
Obscene gains 517 Health from Obscene’s Echo of Light

You may notice that the ticks from Echo of Light which came after Heal are healing for less than those that came after Greater Heal.  You may also notice that refreshing Echo of Light before it was finished ticking down caused a 7th tick of Echo of Light to take place the next time around.  As stated earlier, Echo of Light typically only provides 6 ticks.  What does it all mean?  It means that you did not actually heal for any less because you refreshed Echo of Light with a smaller heal.  Let me show you how.

If you total up all of the Echo of Light ticks that took place in the previous example, you would come up with 4803.  This is roughly the sum of 16% of the amount of your Greater Heal (3425) plus 16% of the amount of your Heal (1284) or what each would have normally healed for had the heal not been clipped.  You can see that you haven’t actually lost any healing.  You probably gained some, depending on how much mastery rating you have.  Mine is currently at 13.25 for the purpose of these examples.

The game  took the amount of healing done by Echo of Light from the first heal (21408 x 16%), subtracted the healing that was already done (592 + 591) and then adds the healing that would take place by Echo of Light from the next spell (8026 x 16%).  Then it divides that amount by 7, which give you 7 ticks of Echo of Light.

3425 – 1183 = 2242 + 1284 = 3526/7

When you add it all up, you will see that your Echo of Light was not affected negatively and you have not lost any healing by casting a smaller heal over a larger one.

Should you be stacking mastery?

Ah, the big important question.  Unfortunately, there isn’t a cut and dry answer.  Our mastery thrives on a number of factors, which include but are not limited to the particular fight that you are on, the number of and the class of healers you will be healing with and how much mastery you have available to you.

Echo of Light tends to work best on encounters where people are not guaranteed to be topped off, so it can actually heal those that need it and not automatically go towards overhealing.  It works well with cooldown based abilities (like Circle of Healing or Holy Word: Sanctuary) and also has great synergy with certain enchants and trinkets, specifically Heartsong and Darkmoon Card: Tsunami.

At the end of the day, our mastery is strong.  We have very little reason not to take it, but we also don’t want to neglect other stats in favor of it.  The general rule of thumb is to go for Intellect first, then Spirit.  Get enough haste to squeeze out an extra 2 ticks from Renew, which is roughly 12.50% haste (fully raid buffed) and then stack mastery.  I know I say this often, but do what works for you.  Try gemming for more mastery or reforging some of it off and see how you do.  Take a look at logs from different fights and see where your mastery stood out.  Don’t be afraid to really play with it and to see just what our mastery can do for you.

(Many thanks to Elly @ Priest It Forward and the wonderful guest post from Constie, from which I got the calculations that I talked about here and for whose style of writing helped this all seem less intimidating and easier to digest.  Also, thank you to Kaleri, my fellow priest and guildie for hopping on her Draenei and trying out Gift of the Naaru for me on such short notice.)

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11 Responses to “Understanding Echo Of Light”

  1. Zinn March 14, 2011 at 7:26 am #

    Great post! I was going to write something like this myself, but hadn’t gotten around to do the proper testing yet. I will just tell people to check this out instead 😉

    • Oestrus March 14, 2011 at 7:32 am #

      Thank you, Zinn!

      It was a mess. You should have seen me with my notepad and calculator, printer paper hanging out the back, trying to crunch the numbers.

      Considering how much I despise math, it was kind of fun.

      🙂

  2. Derevka March 14, 2011 at 8:13 am #

    Great post! I’ve been trying to push a bit more haste (which has been pretty easy after a few upgrades… namely my Heroic Atramedes Bracers and HC Conclave Belt) and 18% mastery… some models ive run are suggesting I pull out of some of that haste for mastery. Which is what I’ll be doing this week’s reset… I should break around 20-21% mastery after some regemming/forging.

    I’ll let you know how that pans out… again, great post!

    • Oestrus March 14, 2011 at 9:09 am #

      Hullo!

      If I really go full force towards mastery, I can get up to about 17%. I think what makes our mastery so difficult to work with is that it is so situational. I would rather have a mastery that sucks outright than one that shines on one fight, but not on another and so forth. There are times you feel like having all that mastery really saves you and the raid and other times you feel like it’s just mindlessly padding the meters.

      I did notice last night when I drastically cut back on my Sanctuary usage that my overhealing from mastery went down a LOT. That makes me sort of want to go back to gearing for mastery. I didn’t even think to really tie the two together, but now I’m starting to think otherwise.

      Good to see you here and thanks for the praise!

  3. Healthplan March 14, 2011 at 9:55 am #

    Great post Oestrus! I admit when I first saw the EoL numbers getting lower I thought it was a bug of some sort, but I’m happy to hear that it rolls over and stacks like it should.

    BTW, your numbers give me a headache. I didn’t do so well in math so I’m glad to see other people doing the number crunching!

    • Oestrus March 14, 2011 at 10:02 am #

      Thank you, Healthplan!

      It was really important for me to be able to follow along with the line of thinking. It would have been really easy to copy the formula from Costie’s post @ Priest It Forward and say “Here you go!” I made sure that I was logged in, casting on myself, using real numbers, etc. I would have felt a bit uneasy endorsing something that I couldn’t make heads or tails of. Once the numbers added up, I felt better about it and finished the post.

      It feels great to know we have a mastery that’s really worth having and using.

  4. ithilyn March 16, 2011 at 4:57 pm #

    Fantastic explanation, thank you!

    • Oestrus March 16, 2011 at 5:17 pm #

      You’re very welcome! I appreciate the thanks and please take care!

  5. Constie July 31, 2011 at 12:55 pm #

    It’s “Constie”.

    • Oestrus July 31, 2011 at 1:12 pm #

      Yes. Yes it is. Thank you.

Trackbacks/Pingbacks

  1. Unfinished Business | The Stories Of O - September 16, 2011

    […] woke up this morning to find that someone had left a link to my Echo of Light post somewhere on the EU boards.  Normally, being linked like that would have been something I […]

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