you could have 95% cold resist, and Can not be Frozen against him, but guess what, you will take the same amount of damage, and be frozen reguardless.
I assume you are playing expansion, gear up the merc and yourself with life leech gear and + to def. Put any veriety of skull in the weapons you use (if possible) this will steal life from him for every hit.
Open a tp as soon as you enter the chamber, (this will save time in the long run if you die) Stand close to Durrel, so does not do his charge attack, and just swing away. If your defense and life are low lvl up some. Use a merc, (get one that has prayer aura or might aura) he will help alot.
Or, you also have the skill bash, this stuns the enemy. USE IT! let the merc do attacks while you stun.
If this does not work still, lvl up some more... their is no mention of you having warcrys .... Do you have any? Battle Orders, Battle Command, Shout, are the only ones you will need, put at least 1 point into them asap.
If this fails, turn off the computer, till you have a editor.