Tartarus
"This is the entrance to Tartarus?"
Poseidon asked Zeus who held the map of Tartarus since he is the only one who knows his way around here and grew up outside of his father's stomach and in the Realm.
Zeus looked at the entrance in front of him and the map in his hands and nodded "yes, the moment we pass through that portal, we are inside Tartarus, so we have to proceed with caution" he said while looking at his companions.
"You lots should proceed with caution because whatever happens inside, I will not interfere unless, it involves the Primordial, Nyx, since she is the reason why I am here" said Coriel who was lying with her eyes closed on a flying cloud she made for the journey.
Hades, Zeus and Poseidon just nodded before looking at one another and walked inside the shimmering red portal leading to the place of the damned souls, Tartarus.