In an upcoming session, it is highly likely that my D&D group will encounter a fearsome Astral Dreadnought.
In the lore, an Astral Dreadnought is a huge monster dwelling on the Astral Plane. There is likely going to be an element of hide-and-seek to the combat, because the creature is too terrifying an adversary to battle head-to-head, and so I was hoping for the sound of a creature to help me sell when it is getting closer.
I am ideally looking for something a bit different to a conventional monster growl - something a little more ethereal and / or bizarre, to convey the pseudo-Lovecraftian vibe of a Terror from Beyond, etc.
Any guidance from the experts would be greatly appreciated - thanks!