Astral dreadnought

Astral dreadnoughts were gargantuan outsiders.

Ecology
The secretion of an astral dreadnought was one of the material components for the powerful spell Waethra's warm welcome, protecting an area against magical travel.

History
Astral dreadnoughts were originally created by Tharizdun, with the objective of hunting down travelers who searched for portals into the Outer Planes. Setting the ageless creatures loose with their insatiable appetites, Tharizdun hoped to prevent mortals traveling in the Astral Plane from gleaming into the secrets of godhood.