Nightmare runs from difficulty 1 to 10, and everything in it drops at item level 100 no matter how deep you go. It opens at character level 100, and you can be matched with strangers.
Wipe here and you lose 15% of your Renown.
50 bases and 58 Uniques drop here, and 7 bosses belong to it: Imp Overlord, Frost Wyrm, Cinder Wyrm, The Vampire Lord, The Spider King, Thunderroc and The Mountain Sire.
It holds 2 modes — Nightmare and Hell — sharing the same door but not the same rules.
Modes
2 modes
| Mode | Goes up to | iLvl | Loot × | XP × | Getting in | Renown | |
|---|---|---|---|---|---|---|---|
 | Nightmare matchmaking · effective threat 24+2/step · bonus loot at 4, 7, 10 |
10 | 100 | ×1 | ×1 | Lv 100 | 55 + 0.35/step |
 | Hell no matchmaking · effective threat 44+2/step |
10 | 110 | ×1 | ×1 | Lv 100 [Object Object] Nightmare 10 |
240 + 0.12/step |
Bosses
7 bosses
| Boss | Biome | HP | Uniques here | |
|---|---|---|---|---|
 | Imp Overlord | Demon Gate | 960 | 7 |
 | Frost Wyrm | Frostmere Reach | 1050 | 6 |
 | Cinder Wyrm | Cinder Forge | 900 | 5 |
 | The Vampire Lord | Bloodspire Keep | 960 | 8 |
 | The Spider King | The Sporeveil | 1140 | 7 |
 | Thunderroc | Skyreach Bastion | 930 | 3 |
 | The Mountain Sire | Cragmaw Deep | 1350 | 6 |
Uniques you can find here
The Courtier's Seal
Immaculate Farhollow Band · Imp Overlord
Riftguard Visage
Sovereign Dreadmask Helm · Imp Overlord
Gatewalker's Greaves
Exalted Longroad Boots · Imp Overlord
The Open Door
Exalted Hollowstep Boots · Imp Overlord
The Hundred-Handed Court
Perfect Bonechoir Staff · Imp Overlord
Rifthunger
Perfect Voidsiphon Staff · Imp Overlord
Doormaker
Perfect Gravebloom Wand · Imp Overlord
Emberscale Mantle
Exalted Wyrmscale Mail · Cinder Wyrm
Slagheart Signet
Immaculate Midnightsun Band · Cinder Wyrm
The Pyre King's Edge
Sovereign Pyreking Zweihander · Cinder Wyrm
Heart of the Furnace
Eternal Cinderwake Relic · Cinder Wyrm
The Glassblower's Breath
Eternal Weepingglass Relic · Cinder Wyrm
Deepfrost Signet
Immaculate Deepfrost Band · Frost Wyrm
Frostwyrm's Tooth
Sovereign Sleetwing Dagger · Frost Wyrm
Snowblind Steps
Exalted Palimpsest Boots · Frost Wyrm
The Frostwyrm's Breath
Exalted Mothlight Tome · Frost Wyrm
The Glacier's Patience
Sovereign Glacier Tower Shield · Frost Wyrm
A Hundred Winters
Sovereign Hailburst Dirk · Frost Wyrm
Invitation to the Banquet
Immaculate Redtithe Band · The Vampire Lord
Rosethorn Cadence
Sovereign Thornheart Sword · The Vampire Lord
The Midnight Cotillion
Exalted Longroad Boots · The Vampire Lord
The Late Waltz
Sovereign Bloodwaltz Dirk · The Vampire Lord
The Vampire Lord's Needle
Sovereign Redletter Rapier · The Vampire Lord
Crimson Communion
Perfect Bloodrosary Staff · The Vampire Lord
Getting in, and what it costs to fail
before you walk in
Opens at level100
Opens at Threat1
Gold lost on a wipenone
XP lost on a wipenone
XP you keep from the runnone
Renown lost on a wipe15%
Costs you the characterno