Burning ones. One of the Uirishg; Elemental Races.  They have an agreement with the anmaglahk to produce their weapons for them using their rare white metal.  When an anmaglahk is ready to recieve their weapons, the chein'as give a stone with the name of the elf on it to a seylif to be delivered to the village.  The elf returns to the mountain and tosses the stone in the lava to summon the chein'as.