Zhar (Great Old One)
Zhar is a fictional deity in the Cthulhu Mythos. The being first appeared in the short story "The Lair of the Star-Spawn" by August Derleth and Mark Schorer. Zhar and its companion Lloigor are together known as the Twin Obscenities.
Its also speculated that Zhar and Lloigor are both offsprings of Hastur and Shub-Niggurath.
Zhar in the mythos
Zhar is a Great Old One and appears as a colossal mass of tentacles. The being came from the star Arcturus, but now dwells beneath the buried city of Alaozar on the Plateau of Sung. It is served by a cult known as the Tcho-Tcho's "Brotherhood of the Star Treader." When called upon by the proper incantations, Zhar can project itself astrally in the form of the Tulku. It can also telepathically transmit its urges to its worshippers.Zhar is believed to be physically connected to its "twin", Lloigor, perhaps by a long extension of tentacles. In Derleth's classification system, both Zhar and Lloigor are air elementals.
Lloigor
Lloigor is another gargantuan monster that dwells beneath Alaozar with Zhar. Together, they are known as the Twin Obscenities. Lloigor appears as a titanic, winged mound of undulating tentacles and is also served by a cult known as the Tcho-Tcho's Brotherhood of the Star Treader. It has the power to control great winds, which it can use to snare and capture any unfortunates who chance upon it. Like Zhar, Lloigor can project its image whenever Arcturus is in the sky.A race of energy beings known as the Lloigor shares the same name with the eponymous Great Old One; however, there appears to be no connection between the two.