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RUMBLE!
The skies of Abyss trembled and reverberated by the sound of crackling thunder and the very fabric of space being torn apart, Yog-Sothoth's transformation triggered as he fully opened the doors that encompassed his very being.
The powers he maintained sealed as an Outer God were tremendously vast, especially of Ancient Outer Gods, whose power was tremendously high compared to the much smaller Lesser Outer Gods. Their very bodies were embodiments of Void and Chaos, and therefore, the more power was unleashed, the more space and even time was distorted around them.
To prevent that from happening and destroying everything in their wake, the Ancient Outer Gods would seal their true powers into lesser forms themselves, containing their Void and Chaos powers. But right now, Yog-Sothoth couldn't care less about the safety of this world.