The Dream-Quest of Unknown Kadath
In Lovecraft's cycle of horror sonnets, "Fungi from Yuggoth", sonnet XXVII "The Elder Pharos" mentions the last Elder One who lives alone talking to chaos via drums: "The Thing, they whisper, wears a silken mask of yellow, whose queer folds appear to hide a face not of this earth...". This thing with a silken mask of yellow also features in "The Dream-Quest of Unknown Kadath".