Per the title, in the "Dungeons & Dragons" fantasy role-playing game, the grell is an aberration.
This is one of two slavery related episodes of the series featuring one of the stars of Star Trek: The Next Generation (1987). Brent Spiner previously played Professor Trent Davis in The Deprogrammers (1996), in which humanity has been enslaved by the Torkor.
The collar around Jesha's neck is a combination bike lock.