Yog-Sothoth is an Outer God and is the embodiment of time and space across an essentially infinite number of space-time continuums, allowing him to be connected to the multiverse itself. Much like how the universe was created by God, Yog-Sothoth is the manifestation of the would-be universe that was created by Chaos. Meaning that Yog-Sothoth is the literal chaotic multiverse that was created by Chaos in place of the current multiverse that was created by God. Because of its status, Yog-Sothoth is omniscient, having no superior and with the only one rivaling it in terms of omniscience is God Himself.
Yog-Sothoth is said to be the first Outer God that was created due to the fact that it embodies the universe molded by Chaos. And when God witnessed the sort of horrendous and terrible creations that Chaos is capable of constructing, He waged war against the eternal darkness. After the defeat of Chaos, Yog-Sothoth was imprisoned by God in an what is said to be an omni-lock, meaning that it is completely locked away from the current mainstream reality and among other realities, with it being its own reality that inhabits an existence which is not connected to any of the branches of creation and defines both human and inhuman conceptual equations made by the clashing between God and Chaos.
Nevertheless, Yog-Sothoth is among the most powerful beings in existence, with its power being almost equal to that of its creator. It is a limitless cosmic being that is connected with all of space and time yet is locked away from mainstream reality. This monstrous deity sees all and knows all and can impart knowledge to anyone foolish enough to seek its favor, which often required human sacrifice or worse and would ultimately bring calamity and ruin to the would-be-follower.
Like its brethren and children, Yog-Sothoth is thoroughly indescribable and unconcievable, way beyond human comprehension, and those in its presence can only perceive an approximation. it was described in many different ways throughout the various legends. However, there seems to be a common agreement that Yog-Sothoth visually manifests as a mass of glowing orbs that continuously merge, regrow and break apart, with eyes or tendrils in some versions. This shows that despite its locking, Yog-Sothoth is capable of communicating to some extend beyond the "No Space", demonstrating a form of ominpresence as well.