Found out something by accident, after testing it proved to be a valuable exploit.
TL : DR version
Get imprinted, reset encounter, do insane dps to hatchlings
Full version:
First, a quick explanation as to how mage invisibility resets encounter. If you invis, and then not do anything that causes threat, once last person dies you will leave combat - note that mobs will still attack you and boss will still cast spells on you etc, but if you do not fight back, once you are the only person alive, they will dissapear. This is for BOSS encounters only.
Anyway we were on alysrazor, and a wipe was called. As always (for mass res), i invised, then ran around dodging stuff waiting for people to die. I had a hatchling imprint on me, so i iceblocked. Then last person died, and the hatchlings and boss dissapeared - but i was still alive (which is why i invised in the first place). The unexpected fact was that i still had the imprint from a hatchling!
We decided to test if it will work, and did a quick recovery. When we pulled, first hatchlings came when i had 2 min left on the buff. And guess what?
300k noncrit arcane blasts ftw. This made the first hatchling phase so incredibly easy - also, a single imprint had bonus damage for both mobs, so you can dps both down, or focus on just one.
PLEASE NOTE: the encounter MUST be reset when you get imprinted. Just vanishing / invising / FDing / etc wont work, as hatchlings will stay on you. You need to get imprinted, and then survive until encounter resets - what i do is i invis, then run around using shield and ward, and iceblock at last second. Just make sure you dont attack or buff or debuff anything.
This has been working as of yesterday, monday 19 july on EU server.
Enjoy