Nightmare Dungeon Guide

Important: You can fast travel to Nightmare Dungeons by clicking on the Dungeon after activiating the sigil.

Sigil Crafting: When to do it?

Getting into Ancestral Tier Dungeons is the most important part of this.. otherwise, it's worth crafting sigils to get achievements -- particularly, 40, 50, 75, and 100.

You Should Target Level 31 Tiers for a Chance at Ultra Unique Gear.