You will have to bring two types of spells to make sure you are going to survive. Both of these are in the ancient magicks spellbook. You will need ice and blood spells. These will have to be either ice burst, ice barrage, blood burst or blood barrage.  Your ice spells will be needed to deal the majority of your damage. The spells deal a little more damage and are cheaper to cast. The blood spells are going to be necessary to make sure you do not die. While your protected melee spells will cover the damage Nechryaels do, their spawns can hit through it. While they only hit 1 or 2 at a time, it quickly adds up. Using a blood spell every few casts will make sure you can stay the entire trip and will save you inventory spaces that would have been used for food otherwise.