How is Shasshhiy'Kaish one-shotting me?

[Arakes]

I´ve beat that bitch in several runs already. Usually, it was not too difficult, but it happened to me two times already that she one-shotted me on sight.
The last time this happened was especially annoying because my character was basically as sturdy as he could have possibly been - it was completely
impossible to survive her attack.
I encountered her in the ancient elven ruins, playing as an Ogre Alchemist with high constitution (I had over 870 hit points). My fire- and all-resistance had been
at 15%, and I had escorted three sun paladins which gave me a Chant of Fortitude at level 3 (22% damage reductions for hits from 3+ tiles away), and as soon as she saw
me - she hit me eight(!!) times in one round, four times for fire damage and four times for physical damage, amounting to over 900 damage in total. And that was *not* a
critical hit... Usually, she doesn´t have an attack that strong (as I said, I´ve beaten her several times already and only two times out of those was she strong enough to one-shot me).
It seems that the physical damage came from a meteroric crash, but that should hit me one time and not four times, right?
I´d really like to know what this attack was (oh how I´d love to have a character that could use it... ) Is this a bug or is it really supposed to be *that* insanely powerful? And if it is, how the hell are you supposed to survive this? If I had a shield on, I might have survived that round but with hit points close to zero, so a critical hit would still have certainly killed me and had I played, say, a Shalore Alchemist instead of the Ogre - even a shield wouldn´t have saved me.
I know nothing other than Unstoppable or Bone shield or the incredibly strong shields of the Archmage that would have guaranteed to survive more than one turn against her when she
has access to that attack.
I know that I don´t have to kill the cultists and fight her - what bothers me is the randomness here, it would be ok if she´s stronger in some runs than in others, even much stronger, but it shouldn´t be the case that she is sometimes so ridiculously strong that all classes except for five (Berserker, Marauder, Archmage, Reaver, Corruptor) are guaranteed to die as soon as they see her.

[Arakes]

Found the answer - it´s the Meteor Rain talent from her Crown of Burning Pain. If I understood it correctly, you can get hit by more than one Meteor from Meteor Rain and the odds of this happening increase significantly if you stand in a narrow corridor. So it is not that Shasshhiy'Kaish herself was stronger as I incorrectly assumed, it´s rather that the Meteor Rain talent is more effective in narrow corridors and if 4+ Meteors hit you at once, you are pretty much screwed. So my lesson would be to only fight her if you have the chance to do so in open spaces like the Mark of the Spellblaze because otherwise, the risk of getting one-shotted by Meteor Rain is just too high.

[Razakai]

Correct. Her Meteor talent drops them in a random radius around you, so in a corridor you can easily be hit by 3-5 at once. Seeing as they have 250 sp scaling (just under fireflash) it's incredibly painful. Even standing in the open can still result in you being randomly hit by a few. She has 50% stun resistance, so stunning her right off the bat isn't totally reliable either. Best to pop your best defensive cooldowns like heroism, shielding etc right away, and try to land a stun/silence asap. She's not that threatening after using meteor, although inner demons can be very dangerous.

[Arakes]

Correct. Her Meteor talent drops them in a random radius around you, so in a corridor you can easily be hit by 3-5 at once. Seeing as they have 250 sp scaling (just under fireflash) it's incredibly painful. Even standing in the open can still result in you being randomly hit by a few. She has 50% stun resistance, so stunning her right off the bat isn't totally reliable either. Best to pop your best defensive cooldowns like heroism, shielding etc right away, and try to land a stun/silence asap. She's not that threatening after using meteor, although inner demons can be very dangerous.

Thanks! Than I have just one more question - I have gotten the achievement "Killed Shasshhiy'Kaish after letting her grow as powerful as possible" before and I don´t really know what that means, how does she grow more powerful?

[Micbran]

Killing one cultist causes her to become the most powerful, therefore causing The Crown of Burning Pain she drops to be most powerful version. Killing all the cultists yourself results in her weakest form and thus the weakest form of The Crown of Burning Pain.

[sajberhippien]

Correct. Her Meteor talent drops them in a random radius around you, so in a corridor you can easily be hit by 3-5 at once. Seeing as they have 250 sp scaling (just under fireflash) it's incredibly painful. Even standing in the open can still result in you being randomly hit by a few. She has 50% stun resistance, so stunning her right off the bat isn't totally reliable either. Best to pop your best defensive cooldowns like heroism, shielding etc right away, and try to land a stun/silence asap. She's not that threatening after using meteor, although inner demons can be very dangerous.

Thanks! Than I have just one more question - I have gotten the achievement "Killed Shasshhiy'Kaish after letting her grow as powerful as possible" before and I don´t really know what that means, how does she grow more powerful?

If you only kill one of the cultists before she arrives, she'll be at her strongest. The more you kill the weaker she gest, and you don't get the achievement.