Nightmare
Players can initiate the fight by disturbing The Nightmare while she is in her sleeping state.
If there is already a fight in progress, The Nightmare will be seen in a floating state with a glowing symbol on the ground beneath her. During this state, the symbol will indicate which of the 3 phases the current fight is in: The Nightmare - first phase symbol.png|This symbol indicates the fight is in the first phase. The Nightmare - second phase symbol.png|This symbol indicates the fight is in the second phase. The Nightmare - third phase symbol.png|This symbol indicates the fight is in the third and final phase.
If The Nightmare is already in her floating state, players will need to wait for the current fight to finish as her instance is not joinable mid-fight. Alternatively, players can hop to look for potentially available worlds.
Guide, gear, inventory, locations, pictures and money making rates from the OSRS Wiki (CC BY-NC-SA 3.0).