Otherworldly beings are found in the south-west of Zanaris, south of the range.
They used to be popular monsters due to the chance of their dropping dragon helms and their close proximity to a bank. However, this was back when the helms were very rare and above 1 million coins in price. Due to the frustrating and constant mini-random events in Zanaris, the Otherworldly beings are not commonly fought. They are located just South of the bank and cooking range in a separate room. Good gear is recommended for lower and higher levels as they can frequently hit 60s and 70s, therefore it is recommended you have good food (such as monkfish or sharks).
Slayer masters give the following advice for this creature: "Otherworldly Beings are ethereal beings making them weak to ranged attacks."
Otherwordly beings received a graphical update along with Zanaris on 13 May2010. Prior to the graphical update, Otherworldy beings were apparently invisible beings, and hence appeared as floating Dark Wizard robes. However, after the update they now have visible body parts.
Their old examine text was: Is he invisible or just a set of floating clothing?
If a Zanaris random event is triggered which renders you temporarily unable to attack (like turning into a pig or a chicken, performing the Dance emote) and you are in combat with an Otherworldly being, the Otherworldly being continues to attack, hitting for no damage. You are unable to retaliate, however.
In Runescape Classic, Otherworldly beings dropped 2 coins each kill.