Nightmare Sigils come in a wide variety of Tiers, indicating how challenging they’ll be, how many negative affixes the player will face, and how rewarding that dungeon will be when completed. You’ll also find more Nightmare Sigils at the end of each Nightmare Dungeon to keep your nightmarish exploits going. In addition to being more challenging, Nightmare Dungeons also allow for a finite number of revives, and if you die more than the dungeon allows you’ll fail and get kicked back into the overworld.Ĭompleting Nightmare Dungeons grants high value loot and the ability to upgrade Glyphs, which you can read more about here. Negative affixes include enemies having a faster attack speed, dealing more lightning damage, and other strange things like a lightning storm striking you with high damage lightning on a regular basis or a sentient crystal following you around trying to stomp you flat. Positive affixes include things like dealing additional frost damage, enemies dropping additional gold, or killing enemies reducing player cooldowns.

They also come with randomly rolled positive and negative affixes that add one specific benefit and multiple debuffs to create an additional challenge. Nightmare Sigils correspond to specific dungeons and can only be used to access that dungeon.

Diablo 3 set dungeon guide