"Hello, my dear friends," said a voice. She could hear the bloodlust and insanity in the voice, but still it sounded familiar.
"Who are you?!" yelled Annbeth.
"I'm disappointed you don't recognize my voice, sweetie. After all you love me and you're having my child."
"Percy…?" Annabeth whispered, scared.
Then Percy stepped out of the shadows. There was a evil grin covering half of his face. He laughed. It sounded as if Percy was insane, he walked towards her Riptide in his hand. Annabeth slowly took small steps backward. This isn't Percy, It can't be, Annabeth thought, But still it looks just like him. Then she realized where she had seen this face before. This was how Percy looked when he controlled the poison in Tartarus, except this was ten times worse.
"Oh, Annabeth join me. We can defeat everyone together with the help of my dearest friend."
"Join you? What are you talking about? And what dearest friend?"
WELL HE IS TALKING ABOUT ME OF COURSE. I'M HIS DEAREST FRIEND. PERCY, SHOW YOUR LOYALTY TO ME BY KILLING ALL OF THE DEMIGODS IN HERE.
"Certainly, Tartarus."
Percy was beside Piper in a flash, it was impossible for anyone to see him as he moved. He had been improving his sword skills at Camp Jupiter, but Annabeth didn't realize how good he was. No one could reach him to protect Piper because there was a puddle of a black liquid surrounding them.
"Don't touch the liquid!" shouted Annabeth, "It's poison!"
So that's what made him like this, Annabeth thought to herself, Tartarus knew what happened to Akhlys and he used that against Percy, making him control the poison had turned him into this.