Atticus O'Sullivan

Within Kevin Hearne's fictional cosmology, Atticus O'Sullivan is a human-born individual who survived into the present as a druidic practitioner and is presented in series materials as effectively the last (or last real) druid. His long life—described repeatedly as two thousand years—places him as a surviving lineage-bearer of ancient druidic practice transplanted into a modern, pantheon-rich world in which gods and mythic beings remain active. The supplied summaries portray his longevity and druidic status as the core origin premise rather than offering a detailed in-universe birth myth or ritual of empowerment.

Sources describe Atticus as a handsome, tattooed Irishman who looks like a young rock star while actually being two thousand years old. He is depicted in promotional and summary material as visually modern and charismatic—tattoos and a rock-star appearance—contrasting with his ancient druidic identity. Specific consistent physical details beyond 'handsome' and 'tattooed Irishman' are not provided in the supplied materials.

The supplied materials characterize Atticus as a Druid with extraordinary magic powers and extreme longevity (circa two thousand years). He engages in combat with vampires, gods, witches, werewolves, shapeshifters (including skinwalkers), and other mythic foes, and is portrayed as a capable fighter who uses druidic magic in broad, aggressive and strategic ways (e.g., confronting vampire legions, acquiring mythic weapons). He possesses or has possessed powerful artifacts that attract divine attention—most notably the Fragarach, a sword of unearthly power whose ownership draws pursuit from the Celtic god Aenghus Óg—and forms alliances with trickster deities (for example, the Navajo Coyote) and other supernatural allies. The provided sources do not enumerate specific spell formulas, internal mechanics of his longevity, or exhaustive lists of powers.