The Keys of the Eternal Gates are fictional items in the Dynamite universe which first appeared in 2019 in the 1st issue of 1st volume of the Bettie Page: Unbound comic book series.
The Keys of the Eternal Gates are powerful sorcerous artifacts, of which there are five of them. All of which can fit in the palm of a human and are attached to a necklace. Each is able to open a portal to summon one of the Great Old One. Together they can release them from their dimensional prison or imprison the Old Ones. They are scattered across time, space, and dimensions with one of them on Earth, the Tunguska Star (aka, The Sorcerer's Star).