Quick answer
Clear the preceding tier without relying on a random carry.
Field checklist
- Clear the preceding tier without relying on a random carry.
- Remove obvious weak gear slots that fail the timer.
- Know the boss telegraphs on that dungeon page before adding damage greed.
- Keep one primary damage stat. Hybrid panic specs stall Nightmare more than they save it.
What to avoid
Do not assume that a legacy Dungeon Quest spreadsheet, level gate, class label, or code applies to Dungeon Quest Reborn. Hardcore is a separate question. Do not treat it as the rung after Nightmare until the live client says so.