When you start the quest your find yourself at the start area of the Secret Lair of the Snowmen. You will be accompanied by five Shifty Grentches and the boss Grentchus Magnus. At fixed battles you are reinforced by a fixed number of Grentchies usually 4. The last three battles involve many Snowmen so its important to keep your Grentchies alive during the earlier battles. This means typically draw aggro yourself and either dodge back and forth or use Ice Fort; and it means resting between battles so your grentchies regenerate.