Its members were said to wear clothes made from the fibers of the transparent mere plant, earned garment by garment as apprentices. Journeymen went on to a knife tempered in mere sap. Masters of the Guild acquired mere tattoos, bit by bit covering every inch of their bodies including eyeballs and as far into every orifice as the dye needles would reach. The Grand Master was said to be totally invisible, able to walk through walls, and quite insane from mere poisoning—if one believed that such an unlikely thing as mere existed.
– Jame's narration, Seeker's Mask, "Part I", III
The Bashtiri Shadow Guild are a guild of assassins who are noted for their determination and invisibility. The invisibility comes from the transparent mere plant; apprentices earn clothing made from its fibers, garment by garment, while journeymen get a knife tempered in mere sap, and masters acquire mere tattoos covering eventually their whole bodies, including eyeballs and as far inside every orifice as the tattooing needles can reach.