Some Vestiges listed in 3e were Ashardalon (a really powerful Red Dragon), Astaroth, Acererak (the Tomb of Horrors Lich), Kas (the vampire rival of Vecna), Gaia, Geryon, Karsus, Primus (or at least a remnant of a previous top Modron) and Teneborous (the identity Orcus assumed after he was...