* riguardo gli adds:

Actually, killing one-two adds per cycle is extremely easy while a healer type kites the rest. It takes a little longer, but allows you to take a break between cycles to heal up, instead of taking a little extra damage from wounds/rangeds while kiting. Once you have the adds clear, you can take all the time in the world to kill the boss - so if you are having trouble advancing through the 23k point, kiling the adds, taking a couple of cycles to recover power, and then focusing on burning her down afterwards may be the easiest way to go. Not fastest, but easiest.
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in ogni caso è utile solo per guarire/ripigliare power tra le fasi, infatti:

killing all of the adds of any given type breaks HM. You get a message that she is weakened, but I am not certain this is the case. She still heals around the 23k point even with all adds down - but not sure if that is a named skill heal, or an independent health-based heal.
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Regardless of how many adds are alive, she will get a full 7k or so heal at least once or twice if she is around the 22k health range.
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* riguardo Ergoth

Facts:
-Inbetween 25k and 10k of her health, she heals every phase for 7 to 8k,
this is part of the fight and part of the challenge
-no amount of adds killing changes anything (tested myself)
-positioning doesnt change anything (tested myself)
-the healing cannot be interrupted

Solution:
Have enough DPS to power through from 25 to 10
It's as simple as that.

This boss is usually so easy that people don't run into this problem very often, because most groups have enough DPS to not notice this "feature" at all.
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It's also worth remembering that if you get an FM off, go for 3 yellows as they will continue to damage Ergoth even when she jumps up in the air and goes inactive.
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Additionally, I think there's been a crucial thing people on the pages above have neglected to mention. She has a couple of things she can do while you're attacking her, the first option, is she'll target 1 person with a ghost, they get 100 gloom. That's the one you want, 6 pieces of radience, or any radience (even destiny) and a token, and you're fine. The painful one is where she says "Let their hides be my protection" then she cuts all incoming damage by 50% for about 30 seconds, iirc. That's when it gets really hard to make headway on the 6k heals. Usually, if you can burn through at least 3 or 4k and the next one she she doesn't do that, you'll be okay. If you get 3 or 4 of those in a row, that's when groups wipe, and unfortunately, sometimes, that's just the luck of the draw.
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FACTS:

1) You can do this fight by simply burning her down if you have enough DPS
2) Ergoth's heal begin ramping up some time around 23k morale
3) Ergoth stops healing when she gets below ~10k
4) Any DoTs ticking on Ergoth keep damaging her when she is invulnerable, even though you can't see them on her
5) Ergoth sometimes gets a buff ("Let their hides be my protection") which reduces her damage taken
6) Killing all of Ergoth's adds will not prevent the heal she does below 23k morale
7) Killing/interupting the summoning adds at the edges does not prevent or reduce her heal
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Prept the boss to about 25-26K, if you come out of the adds phase and the boss does not have the damage reduction corruption, try to burn the boss down to 10K and you will avoid the self heal. If the boss does have the corruption which reduces damage, you are better off just tanking the boss and NOT damaging it when it's at 25K, or it will heal itself significantly more than you are able to damage, making the fight last forever.

Sorry if my suggestion was confusing. I did not mean this would prevent her self healing. What I was getting at, was that with the -50% incoming damage you are likely to damage the boss 5-6K and put her at 20K which will result in a bigger self heal after adds phase, then she would fire off at 25k+. Basically you have to balance her being at 25K-30K and NOT have the -damage corruption at the end of the adds phase, then burn her down as much as you can to avoid massive self heals. I do not know of a way to prevent to -damage corruption. It appears to be on a timer.
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Spero possa essere utile...

ciao ciao, a presto.