Enceladus is one of the Gigantes and one of the main antagonists in The Lost Hero, and one of the many secondary antagonists in The Blood of Olympus.

Enceladus captured Tristan McLean, the father of Piper McLean, so that he could use his daughter to lure Leo Valdez and Jason Grace to him. He had hoped that they would be killed along the way, but was still pleased to have Piper lead them to him so he could kill them himself. He also appeared to Piper in a dream where his flying head was seen over a purple fire while over Detroit. He showed her the pain her father was in and threatened her not to betray him. When she woke up, Festus was falling out of the sky and Piper thought Enceladus somehow managed to attack them from so far away. When confronted at the top of Mount Diablo, he claimed he was born to fight Athena, calling himself the anti-Athena. While Jason and Leo attacked him, he called upon the Earthborn to help him defeat the demigods, but most were destroyed when Leo used the construction equipment in the area and Piper managed to take out one with her dagger. He was killed at Mount Diablo by a combined attack from Jason Grace and a lightning bolt from Jupiter, as only a god and a demigod working together can defeat the giants.