Season 2 of introduces new bosses to fight across Sanctuary, including a frozen foe named The Beast in the Ice that you'll have to summon by unlocking a Nightmare Dungeon. Only a specific item your character can craft is able to open the path toward this dangerous boss. Only those who have progressed to a high enough level and World Tier will be able to challenge The Beast in Ice for Unique gear rewards.
The Beast in Ice resides in the Glacial Fissure Nightmare Dungeon, a level 85 den of evil that is only accessed within World Tier 4 in . The Fissure may be seen just to the northwest of Kyovashad, but remains locked when you first travel to it. Unlike normal dungeons you find to obtain Legendary Aspects across Sanctuary, Nightmare Dungeons have their own rules that prevent you from challenging them whenever you like.
Related: The 7 Best Nightmare Dungeons For Loot & XP in Diablo 4
The only way to summon The Beast in Ice and activate this rare boss is to craft the Glacial Fissure Nightmare Sigil with an Occultist vendor. These Sigils open up Nightmare Dungeons across the map, and are divided into different Tiers based on their overall difficulty. The Fissure is technically a Tier 31 dungeon, which determines the amount of materials you'll need to craft the Sigil in .
You must gather 9 Distilled Fear and 250 Sigil Powder to craft the right Nightmare Sigil and transform the Glacial Fissure dungeon in. Both items needed can be found as drops in other Nightmare Dungeons, with Distilled Fear in particular being found in Tier 30+ locations. On the other hand, Sigil Powder is received as a product of salvaging Nightmare Sigils of any Tier with the Occultist, similar to breaking down valuable gear with a Blacksmith.
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