Nightmare Zone - OSRS Wiki

The Nightmare Zone is a combat-based minigame located north-west of Yanille bank. Players enter a "dream" to take on bosses they have previously defeated during completed quests. It is run by Dominic Onion, a mage from Lunar Isle. The dreams that make up this minigame take place in an instance of the King Black Dragon Lair.

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Nightmare Zone lobby cow, Old School RuneScape Wiki

OSRS Nightmare Zone Guide - AFK, Most Points Per Hour - OSRS Guide

Update:Minigame Grouping, Old School RuneScape Wiki

I was a bit bored in Nightmare Zone, so I made a friend : r/2007scape

Empty vial (Nightmare Zone) - OSRS Wiki

Theoatrix's Nightmare Zone Guide (OSRS)

BR OSRS

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Nightmare Zone - OSRS Wiki

Official Nightmare Zone Guide - Guides/Achievements - Anonymous