The official GemStone IV encyclopedia.
Clad in emerald robes of lush velvet that are stitched with tiny scales of clacking bronze, the fanatic is nearly fleshless, his reserves of fat and muscle burned away by a long war with madness. He has, judging from the stink of body odor and filth about him, not washed in weeks, and his gaze is as inconstant as the quickfire succession of random emotions that play across his tanned face.
Deathsworn fanatics can sometimes have Elemental Barrier active (+50 DS/TD), and may receive Focus Barrier from nearby lithe veiled sentinels (+30 DS). Their natural defenses are quite low without these spells.
They can summon shambling lurks:
A deathsworn fanatic jabs a trembling finger at you. His blood inflamed by the pure zealotry, he cries, "To me, my creations! Do not let the infidel escape!" The fanatic lifts his arms toward the heavens and the ground underfoot begins to shake. It buckles and splinters, caving in to several newborn chasms. Ragged arms snatch at the edges, fumbling; seeping blood; searching. Slowly, several lurks crawl forth, letting out ravenous moans!
They will also animate any non-lurk dead body (including adventurers) into a lurk:
A deathsworn fanatic stoops over a pale scaled shaper, murmuring a soft prayer. Greenish light erupts from her hands, bathing the shaper. Twitching and popping motions resound from the corpse as she rises anew as a ravenous lurk.
A deathsworn fanatic stoops and places a hand on your chest. Green-tinged light spews from her hand, suffusing your flesh. For a moment, you feel nothing but incredible heat and power flowing through you, but something goes terribly wrong, and a cold hand tugs at your soul. Your last living sight is that of your flesh sloughing away like serpentskin, giving rise to something shambling and heinous.