Ohm was a pixie and phlegm pot cleaner to Frond. It could see tellings of the future written (such as outbreaks of troll pox or gas spasms among elderly dwarves) in phlegm in the pots and was said to be the most gifted phlegm prophet of all time. While it was cleaning the pot of King Frond, it saw into the future. It saw the People driven underground by Mud Men, and the coming of Artemis Fowl II, who would learn the secrets of the People and hold them ransom for gold while aided by a "formidable warrior scarred from a thousand battles." It also saw the betrayal of Briar Cudgeon and how he would try to overthrow the People with help from goblins, and wrote these visions down for posterity and left the notes inside its own phlegm pot for future generations to find.
In Ohm's message, Ohm never said if it was male or female, so Ohm shall remain as "it."