Nightmare: The Most Underrated Group Boss (OSRS Guide)

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The Nightmare of Ashihama is one of the most misunderstood bosses in Old School RuneScape. Written off as bad GP or “not worth learning,” Nightmare is actually one of the best group PvM encounters in the game for learning real mechanics — prayer switching, movement, special attacks, add management, and staying calm under pressure.
In this guide, I break down everything you need to know to get started at Nightmare in mass worlds, even if you’re brand new to PvM. We cover gear, inventory, fight flow, prayer switching, and every special attack, explained clearly and simply so you can jump in without getting wrecked.
Nightmare is perfect if you want challenging group PvM without raid requirements, low death costs, and a place to practice skills that transfer directly into raids and harder bosses.

This guide is designed for:
Beginner and midgame players
First-time Nightmare learners
Players looking to improve PvM fundamentals
Anyone intimidated by raids or “sweaty” PvM groups

🟢 Budget Setup (Entry / Mass Worlds Friendly)
Melee (Main Setup)
Helm: Helm of Neitiznot
Amulet: Amulet of Glory
Cape: Fire Cape
Body: Fighter Torso
Legs: Obsidian Platelegs
Weapon: Zamorakian Hasta (set to Crush)
Shield: Dragon Defender
Gloves: Barrows Gloves
Boots: Mixed Hide Boots or Dragon Boots
Ring: Berserker Ring (i) or Lightbearer
Blessing: Any God Blessing
Spec weapon: Dragon Claws / Burning Claws (or none)

Magic Switch (4-way – minimum viable)
Weapon: Trident of the Seas
Body: Bloodbark Top
Legs: Bloodbark Bottoms
Necklace: Occult Necklace

🟡 Medium Setup (Comfortable Small Teams / Cleaner Mass Kills)
Melee
Helm: Neitiznot Faceguard
Amulet: Amulet of Fury
Cape: Fire Cape
Body: Bandos Chestplate
Legs: Bandos Tassets
Weapon: Abyssal Bludgeon or Zamorakian Hasta
Shield: Dragon Defender
Gloves: Barrows Gloves
Boots: Dragon Boots
Ring: Berserker Ring (i) or Lightbearer
Blessing: Rada’s Blessing 3
Spec weapon: Bandos Godsword or Dragon Warhammer

Magic Switch (6-way)
Weapon: Trident of the Swamp
Head: Ahrim’s Hood
Body: Ahrim’s Robetop
Legs: Ahrim’s Robeskirt
Necklace: Occult Necklace
Cape: Imbued God Cape

🔴 Endgame Setup (Sweaty Groups / Pre-Phosani Practice)

Melee
Helm: Inquisitor’s Great Helm
Amulet: Amulet of Rancour
Cape: Infernal Cape
Body: Inquisitor’s Hauberk
Legs: Inquisitor’s Plateskirt
Weapon: Inquisitor’s Mace or Scythe of Vitur
Shield: Avernic Defender
Gloves: Ferocious Gloves
Boots: Primordial Boots
Ring: Ultor Ring
Blessing: Rada’s Blessing 4
Spec weapon: Dragon Warhammer / Elder Maul

Magic Switch (8-way – max pillar DPS)
Weapon: Tumeken’s Shadow
Head: Ancestral Hat
Body: Ancestral Robe Top
Legs: Ancestral Robe Bottom
Necklace: Occult Necklace
Cape: Imbued God Cape
Shield: Elidinis’ Ward
Ring: Magus Ring or Lightbearer

⏱️ Timestamps
00:00 – Intro: Why Nightmare is Underrated
00:38 – Why Do Nightmare? (Who This Boss Is For)
01:17 – Getting to The Nightmare (Teleports & Location)
01:50 – Group Sizes, Death Costs & Difficulty
02:27 – Minimum Gear Requirements (Crush Setup)
05:05 – Inventory Setup & Supplies
06:00 – Grifting

Mechanics Breakdown
06:29 – Both Phases Explained
07:17 – Normal Attacks
08:30 – Grasping Claws (All Phases)
09:00– Sleepwalkers (End of Every Phase)
09:35 – Husks (Phase 1 Only)
10:01 – Corpse Flowers (Phase 1 Only)
10:34 – Curse (Phase 2 Only)
11:10 – Parasites (Phase 2 Only)
11:50 – Surge (Phase 3 Only)
12:10 – Spores (Phase 3 Only)

Outro -
12:40 – Full Fight Summary
13:25– Next Steps
13:52 – Outro