The Phantom of Truth2variant1

The Phantom of Truth by Glynn Owen Barrass

An apparent entity mentioned, without great elucidation, twice in Robert Chambers' The King In Yellow:

In More Light by James Blish, possibly intended to be the same as The Stranger.

Also the title of a booklet of poems and prose, and one of the poems in the booklet.

In Hymn To Hastur, it is stated to be the Ka of Hastur.

See also Pallid Mask.