Percy's POV:
We headed to 12 Grimmauld Place after that horrible incident to find the Locket of Slytherin. I teleported everyone into the building. There were lots of stuff there and even some people. I said, "We can't just search everywhere. It needs a lot of time and people will get suspicious."
Jason said, "We could ask someone who knows a lot about this house."
At that moment, a house-elf crept behind them.
"Ah," I said. "What's your name?"
"Kreacher." The house-elf said.
"Are you living in this house?"
"Yes."
"Can you tell us about the Locket of Slytherin?"
The elf looked horrified. "You also know about the Horcruxes? Could you help me destroy it?"
"You have it?"
Kreacher held up the Locket of Slytherin. "My master, Regulus Arcturus Black, told me to destroy this Horcrux."
"Well, we can help you then. Come with us."
He followed the demigods into the vortex Percy made, leading to a deserted island.
We directed our wands at the locket and flicked them, spewing out bits of lethal fire, forming a serpent, just like before. We frowned in concentration and finally, the serpent zoomed at it. The Horcrux was destroyed. "Well, I wonder why Voldemort didn't think that people would use Fiendfyre. Not that I'm complaining though. The faster the better. So, another Horcrux down. Two more to go. The cup and the ring. And of course Nagini, but we'll destroy it in the real battle afterward."
Kreacher bowed and repeatedly said, "Thank you, thank you!"
"No." I said, "Thank you, Kreacher."
Third Person:
The nine teleported in front of Gringotts. Percy looked at the building. "This Horcrux will be much harder to get to. First, we'll need one thing: Invisibility. All of us."
"You could use the safe the primordials gave you. You told us that it could grant invisibility."
"Right. Come in." He pulled the piece of paper, turning it into the safe, black safe, and a clear key. He jabbed it into the keyhole of the safe, opening it immediately. He climbed into the safe, with the others following suit. Then they all walked out as the door of the safe slammed shut.
The demigods looked at each other but could still see each other. "We're invisible now, but we can see everyone else."
"Actually, we need something else. Here's a ghost key."
They repeated the process of going into the safe and coming back out again.
"What this does is splits the particles of matter inside you so you become ghostly, can float through everything and stuff. Now we can walk through everything and wait until the effects wear off."
"After that, a big problem would be that we don't know where we could find it. Since I don't know which vault it is in. If I knew, I could teleport there to find it."
"We cannot use our powers and no magic will be able to find a Horcrux and destroy it," Thalia stated.
"Great," Nico grumbled.
Hazel suggested, "We could get Hecate to help."
Percy's eyes lit up. "Yeah, that's a good idea! Call her and maybe she'll help us."
After a few moments, Hecate was there. She looked around and asked, "Who?"
Percy forgot that they were all invisible and replied, "It's Percy here." He described to her quickly about Voldemort's Horcruxes. "We need to know Bellatrix Lestrange's vault number."
"Well, the vault of the Black family is number 711." She said slowly. "But how will that help you?"
"We can teleport there and destroy the Horcrux that way."
"Very well. Call me if you need help again." Without giving him time to thank her, she disappeared.
He shrugged and opened a vortex to vault number 711.
Once everyone got to the vault, they used Fiendfyre again to easily destroy it. "Lastly, the ring." He said, and at that moment, the effects of invisibility and ghost disappeared.
They were at the Gaunt Shack. "Do you think that Fiendfyre will work here?" Percy asked. "It seems well protected. Let's try it anyway."
They directed their wands at all of the stuff. A fire serpent slithered over, but couldn't penetrate the seemingly invisible wall.
Percy directed all of them to retain their ghostly forms. They floated into the shack easily.
"Now let's try Fiendfyre." He said, his wand spewing flames.
They started the fire but failed to control it after. The serpent hissed, creating more. The fire grew bigger and bigger as all of them panicked. At the last moment, Hecate appeared, stopping the fire. "It's dangerous." She said. "Use it more carefully."
They nodded their heads in relief and Hecate disappeared again.
Percy peered at the Horcrux. It was destroyed. He smiled in satisfaction. "Finally, all of the Horcruxes that we need to destroy are destroyed."
He teleported them back to the grand gates of Hogwarts Castle.
(Note that Nagini will be destroyed during the battle and they can't right now because it's close to Voldemort)
