Tartarus POV
'Dad?, what does he mean by dad, I don't know who he is'
"Speak stranger, who are you and why did you massacre billions of monsters in my domain"
Third person POV
Percy hearing Tartarus just smiled menacingly and said "You do not deserve to know who I am Tartarus for I only killed the monsters to draw you out and guess what, it works.
"I admit stranger you really attracted my attention, now speak before I kill you for the murder of most of my domain monsters" said Tartarus.
"Oh I just wanted to kill you of course and after you die I will take over the rule of this dimension as its rightful king" said Percy while drawing his swords from his back (he put it there when Tartarus came).
Tartarus grew angry and said "very brave of you stranger, you dear to challenge me in my own domain, ok then I will make sure to torture you cruelly before ending your life" also conjuring a pure red great sword.
Percy didn't say anything again and just rushed forward with a speed not even Hermes can see and attacked Tartarus with an overhead slash, while Tartarus blocked the overhead slash by bringing his great sword up failing to notice the second sword from Percy until it punctured his ribs.
He kicked Percy back while holding his injured ribs and losing himself in anger.
Percy deciding that he has better things to deal with later use his full sword intent severing Tartarus in half and also destroying half of Tartarus.
As Tartarus dies turning into golden dust a blood red orb from his dust flew into Percy's chest giving him full access to all of Tartarus domains.
After Percy killed Tartarus and got his domain he made sure that Tartarus won't ever reform thus making him fade.
After all that Percy disappears and appears at the front of Tartarus blood red palace, first thing he did was snap his finger thus destroying the palace and making a new one bigger and grander than the last appear.
Later Percy called every being in Tartarus including the gods, Titans and monsters that works directly under Tartarus.
After they all appeared he then killed all the male deities and ensuring they fade thus gaining their divinities also, this he did because all those male deities are part of the people who raped Artemis.
Next he then branded all the monsters and female deities with the mark of Perseus which ensures their full loyalties always, after he made a hundred female deities his palace slaves responsible for running his palace.
After all this he left Tartarus to go back to the surface and carry out his other plans.