Leviathan – These are mentioned by Poseidon in The Last Olympian as giant sea creatures that are neutral in the war between Poseidon and Oceanus. Lupa – The wolf that raised Romulus and Remus. She guides the children of Roman gods to Camp Jupiter after they are left for her at the Wolf House where she trains them to become Roman soldiers upon finding the worthy ones. She is the Roman counterpart of Chiron who does a similar job for the Greek demigods, only she is more militaristic. Makhai – The spirits of battle and combat. In The Blood of Olympus, Asclepius used the Makhai and the Pylosian Mint to formulate a physician's cure. Mania – Ghosts that personify insanity, madness and crazed frenzy. In The Blood of Olympus, Beryl Grace and Julian Ramírez-Arellano are among the Mania. Myrmekes – Giant ant-like creatures who like shiny things like gold. In The Demigod Files story "Percy Jackson and the Bronze Dragon", some Myrmekes trapped Charles Beckendorf in their nest. In The Hidden Oracle, Apollo and Meg come across a trio of Myrmekes who kidnap Meg, forcing Apollo to infiltrate their nest and rescue her. Later, Apollo successfully persuades the mother ant "Mama" to help him and other demigods return to Camp Half-Blood. Nemean Lion – A lion that is one of the children of Echidna and Typhon. It has a hard skin in which no weapon can penetrate. Luke and Atlas sent the Nemean Lion to the National Air and Space Museum to stop the group of questing Hunters and Demigods. It battled with Percy Jackson, but was hard to defeat because of its bulletproof and sword-proof pelt. Percy eventually defeated it by throwing astronaut food into its mouth thus exposing its one unprotected surface, its mouth, to the Hunters' arrows. Zoe Nightshade allows Percy to claim the lion's pelt as a spoil of war and it turns into a bulletproof coat that protects Percy until he sacrifices it to Poseidon. Nosoi – The spirits of illness, plague, and disease that were originally locked up in Pandora's Box. In The Hidden Oracle, a bunch of Nosoi attack Apollo and Meg McCaffrey, but are defeated by them and the Karpoi Peaches. Ophiotaurus – A half-cow/half-snake monster. It was nicknamed Bessie by Percy Jackson who initially assumed it was female, although Grover later informed him that it was a male. Percy saved it