Wikipedia wrote: It is the dark, inaccessible part of our personality, what little we know of it we have learnt from our study of the dream-work and of the construction of neurotic symptoms, and most of this is of a negative character and can be described only as a contrast to the ego. We all approach the id with analogies: we call it a chaos, a cauldron full of seething excitations... It is filled with energy reaching it from the instincts, but it has no organisation, produces no collective will, but only a striving to bring about the satisfaction of the instinctual needs subject to the observance of the pleasure principle.
[Freud, New Introductory Lectures on Psychoanalysis (1933)]
And further down, the wikipedia article notes:
(From: http://en.wikipedia.org/wiki/Id,_ego,_and_super-ego#Id )Freud divided the id's drives and instincts into two categories: life and death instincts—the latter not so usually regarded because Freud thought of it later in his lifetime. Life instincts (Eros) are those that are crucial to pleasurable survival, such as eating and copulation. Death instincts, (Thanatos) as stated by Freud, is our unconscious wish to die, as death puts an end to the everyday struggles for happiness and survival
Interestingly the D20 Dave Arneson's Blackmoor Sourcebook has a deity by the name of Thanatos. Could he be connected to the Temple of Id?
From the FFC we know that the Temple of Id contains the Gem of Sunlight (Extrapolation from David Ross). Also, we know from the D20 Sourcebook that Thanatos' enemy is Sollus. Thanatos killed Sollus' brother Temrin. Could he also have stolen the Gem of Sunlight from Sollus?
I am beginning to think of the Temple of Id as Blackmoor's Temple of Elemental Evil. It certainly has its set of evil cults connected to it.