Twilight of Atlantis is a sourcebook detailing this once-great people, drawn from the writings of Plato. New races such as the Bastai cat-warriors and the Atlanteans appear, new prestige classes (Artificer, Oephean, Resonant, Spellbane) and six new feats to use with them. A whole new approach to magic - that of the resonance, powered by the mystical metal orichalum - is provided, with 10 new spells. Join the adventure today, attempting to overthrow or rescue Atlantis' great empire.