Yokoth and Glythur

Yokoth and Glythur, the latter also known as the Mother of Faceless Hordes, Ravager of Galaxies and the Star of Madness, are Lovecraftian-esque extradimensional entities who rules over an alternate dimension with their offspring, the Faceless Hordes.

Description
Entities whose true form is amorphous and cephalopod-like.

History
Yokoth and Glythur together destroyed or consumed most of their universe, with the assistance of their offpsring, the "faceless hordes". In 1925 a rogue group of Men of Letters opened a rift to that universe, desiring to bring the Old Ones through to "cleanse the world of hate and bring a new paradise". Yokoth came through and devoured most of the group, before they were able to close the rift and bound her. In 2018, she tricked the Winchester brothers into releasing her. She opened a rift for Glythur who began to come through, but the Winchesters managed to close the rift in time as Glythur took Yokoth back to its home dimension.