Before we can destroy the Mythallar, our old friend the Professor Orb shows up with his new drow allies and wants to try a spell to see what happens. What could go wrong?
The Champions will have to face their greatest foe yet and concoct a new plan to save Icewind Dale from the terrors of the Tarrasque!
Note: you will need to have completed the previous two Icewind Dale Adventures, Cold As Ice and Friends & Foes, in order to access these new Adventures.

The Spire of Iriolarthas
Gain the final clue to enter the Spire of Iriolarthas and face the Demilich of Ythryn.Reach Area 600
- Adventure Variant: Always Watching — Always there, even when you thought you had defeated him.
- In each boss area, Iriolarthas the Demilich appears. He must be defeated in order to progress.
- Only Champions with WIS of 14 or higher can be used.
- Complete Area 650
The Fall of Ythryn
Destroy the Ythryn Mythalar, using whatever means necessary.Complete Area 625
- Adventure Variant: Icequake — Destroy the Ythryn Mythalar, while the glacier crumbles around you.
- From area 30 onward, an earthquake occurs every 20-120 seconds. Earthquakes cause a screen shake and cause falling pieces of ice to hit the Champions, dealing damage equal to 75% of their max health and stunning them for 15 seconds (subject to a DEX save).
- The earthquake also triggers the following effects for 15 seconds if one or more Champions fail the save.
- Champion damage is reduced by 99.9%.
- Enemies move 200% faster.
- DEX Save: For each point their Dexterity score is above 10, a Champion has a 10% chance to save against the damage/effect, completely nullifying it. For example, a Champion with 14 DEX has a 40% chance to save against the damage, while a Champion with 20 DEX or higher has a 100% chance to save against the effect.
- Complete area 675
- Adventure Variant: A Lesson in Classes — Destroy the Ythryn Mythalar, with only one of each class at a time.
- Xerophon joins the formation for this adventure to see what it's like to fight alongside the Champions. They don't attack, they're just here to observe.
- Only one Champion of each class can be included in the formation at any time. Multiclass Champions count for all of their classes. Xerophon does not have a class for this adventure variant.
- In an attempt to distract and confuse the enemies, Xerophon transforms into the first enemy who spawns in each area, increasing damage against that type of enemy by 100% for the rest of the area.
- Complete area 725
- Rewards Xerophon, the Doppelganger Rogue