Nightmare Dungeons in Diablo 4
Nightmare Dungeons are the evolved versions of regular dungeons in Diablo 4, amped up with Diablo 4 Items Nightmare Sigils that add various modifiers, increasing the challenge and rewards. These dungeons are pivotal for late-game character development and power scaling.

Key Features of Nightmare Dungeons:
Nightmare Sigils: These sigils modify the dungeon’s layout, enemies, and mechanics, making every run feel different. They add difficulty modifiers, such as:
Increased Monster Damage and Health
Environmental Modifiers like poison clouds, darkness zones, or freezing areas
Enemy Affixes like explosive death, faster attacks, or regeneration
High-Level Rewards: Completing Nightmare Dungeons rewards players with high-tier gear, rare crafting materials, and Glyph XP, which are critical for improving your character’s build.
Scaling Difficulty: Nightmare Dungeons come in different tiers, with higher-tier dungeons offering increasingly difficult challenges but better loot. As you progress, the difficulty scales with your character’s power.
How to Unlock Nightmare Dungeons:
Nightmare Dungeons are unlocked after completing the campaign and reaching World Tier 3 (Nightmare difficulty). From there, players will obtain Nightmare Sigils, which they can use to activate Nightmare versions of existing dungeons.

Nightmare Dungeon Tiers:
Lower-Tier (Tiers 1–10): Suitable for players who have just transitioned to World Tier 3 and are farming gear to improve.
Mid-Tier (Tiers 11–30): Here, the challenge increases, and it’s essential to have optimized builds and strong Legendary items to survive.
High-Tier (Tiers 31+): Reserved for cheap Diablo IV Items seasoned players with high-end gear, pushing these dungeons requires significant damage output, resilience, and coordination.