The ancient depths of Sharn, the tangled jungles of Q’barra, the howling crags of the Demon Wastes, and the cyclopean ruins of Xen’drik are like home to the extreme explorer. Whether motivated by a thirst for knowledge about Eberron’s most ancient civilizations, a hunger for the long-lost secrets of tremendous arcane power, or simply a lust for gold, extreme explorers subject themselves to tremendous danger to achieve their goals—and somehow manage to escape in one piece, often by the skin of their teeth. The extreme explorer is the iconic action hero of Eberron: courageous, resourceful, determined, and just plain lucky.
The key feature of the extreme explorer is his use of action points. He gains more action points than most other characters, and gains action-oriented bonus feats to help him spend those points in dramatically heroic ways. Members of any class can qualify to become extreme explorers without much difficulty, though rogues have a particular inclination toward this prestige class.
NPC extreme explorers are quite rare. They work best in the campaign as plot devices. They can fail to return from an expedition deep beneath Sharn, send their notebooks to a PC pupil before disappearing forever in Xen’drik, or hire the PCs to accompany them into the Demon Wastes.