Astral Dreadnoughts are outsiders in the Dungeons & Dragons role-playing game. The Astral Dreadnought first appeared in PS Appendix II (TSR, 1994) but were first depicted on the cover of the original Manual of the Planes (Jeff Grubb, 1987). They attack characters wandering around the Astral Plane by attacking their silver cords (the link between a character's physical body and their astral form, which, if severed, will kill the character instantly). They also make use of powerful anti-magic to weaken characters who are dependent on magic items and spells as sources of power.