It's not a big deal...All you need is a one healer/Well-player dainn.
(It's a solo-able stage for dainns).
-You don't have to kill all the MOBs!
As a siege, you can pass the ice walls with 'Play Dead'.
As an healer, you can be hit and then heal yourself.
As a Dainn, you can use "Bitter Cold Breath".
The soul ruller is qutie annoying, but one 'summon meteor' can finish him.
At the boss:
If you are a siege (and you are alone), it is going to be hard.
If you are a dainn, you will be able to solo it.
If you are an healer...almost as same as a dainn.
As a siege, you can take an healer with you.
Her role is to heal you after you get knocked-down without HP. (Yes! If you don't move, you will be able to be healed for a while)...