"Daeyalt" redirects here. For the rocks that Daeyalt ore is mined from, see Daeyalt rocks.
Daeyalt ore is a rare ore created from the Stone of Jas. It can only be mined by players with a Mining level of 20 during and after the Darkness of Hallowvale quest, gaining approximately 17.6 experience. It cannot be smelted into a bar. According to those working the Meiyerditch mine, the ore mined in Meiyerditch is taken to a massive underground refinery; however, the nature and purpose of this process is unknown.
During River of Blood, it is revealed that Daeyalt ore is used during the process of vampyrisation, serving as a catalyst for easing changes between states. Later, refined daeyalt is used as one of the ingredients used in making a serum to cure human-born vampyres.
If you use the ore on a furnace it shows the message: "You're not sure what sort of effect you would get by putting this into the furnace." Trying to cast superheat item on it will display: "You're not sure what effect this would have."
Daeyalt ore was not stackable before the update on 20 July2015.
Daeyalt was mentioned by Thurgo in a Postbag from the Hedge. The dwarf stated that the ore had "some magical hoobery-joobery on it" and that "those vampire[sic] types are after the hoobery-joobery."