Enter the Ice Heart Cavern and slay Rattlebore. If it is still in your possession, be sure to use Zort's Protective Elixir to protect you from the Jormungar's corrosive spit. Return to Ko'char the Unbreakable in the Crystal Vice when the task is complete.
The jormungar have a spawnmother in the caverns below. We call her Rattlebore - a name that was gifted to her by an adventurer from the Plaguelands. I saw her only briefly as I was fighting off their initial onslaught - she is large enough to make even my icy bones shiver. This cavern will not be ours until she is removed from it.
Gather your friends and end this.