How to Beat Atziri?

Hiya,

So I farmed 6x sacrifice sets and decided it's time to go find and blast Atziri!

My character is level 82 and my build is a Barrage CoC Shadow with Fireball+Arctic Breath.

I'm wearing a Tabula Rasa instead of a 6L Voll's Protector because who the heck can afford a 6L Voll's? Not me.

I entered The Apex of Sacrifice for the first time last night. At the first boss(es) I got owned. I was using Life Leech instead of Power Charge on Critical Strike in my Tabula Rasa so my damage was much lower. I used up all 6 portals and couldn't progress.

I then switched in Power Charge on Critical Strike and took out Life Leech. My damage was much higher. I managed to get past the first boss(es) with 2 portals remaining.

I enter the second boss room and see the 3 badasses. The cyclone guy charges me and drains me down to 10h. I pump my health flask and survive the first hit. I drain a couple of them down to low life but die. I re-enter, die again. My last portal I get in, manage to kill one but die.

DAMN. THIS SHIT IS HARD!

I've still got 4 sacrifice sets. But I wanted to ask in here if there are any tips to beat these guys and make it to Atziri? I'm not expecting to be able to kill Atziri... I just want to FACE HER!

My build really needs a 6L Voll's so I can put on Life Leech but this is just not possible at the moment.

What tips do you guys have to get past Boss phases 1 and 2 in the Apex of Sacrifice??