Cant deal with Mervil on maps

So ive been running tons of maps lately and stumbled upon unique m ledge twice: once from zena daily(as 83 ranger) once from drop(lvl 68 dual totem mf) even thou I have around 70+ cold res cold res flask + eva flask that gives 30 all res I still get almost instantly one shoted from 2nd form as I enter map on both characters. 1st fpr is easy for both just hide out of her ice storm range and spam totems on her or split/frenzy from a far. But 2nd form is so hard for me. Even if I try to dodge every tornado I end up getting caught in one finally and die. Give me some tips and advices how to do her. Wasted 2 nice drop chances already : /

must have:
- maxing out your cold resist
- having quality cold res flasks with additional cold and freeze protection
- movement skill to be able to kite her attacks

recommended:
- getting additional resistances on flasks that don't easily refill (quicksilver for example)
- enough single target dps to fight the adds (flying swords)




merveil in graveyard is not an easy boss at all so don't worry if you got problems fighting her in that small arena