Source: What Lies in Dust, pg(s). 58
Felhart is a relic claimed by the Pathfinder Society in recent years. It is a crude and ferocious-looking bow made of several pairs of stag horns, fastened together and strung with a gleaming string. Pathfinder Sahrasong Eirodour, reporting from Tamrivena, used the bow and killed Grothtolr, the precociously named Stone King. Once per week, felharts wielder can summon a lean, swift white elk with an almost ghostly appearance. The creature allows felharts wielder to ride it, and serves loyally for several hours and vanish after that.