Ghul lamp

A Ghul lamp is a special type of XP lamp that requires you to join a lamp pot, lamp handle, and spout of the same type. You cannot mix and match other genie lamps. When combining the parts, players will be notified that the process is irreversible and the lamp will become untradeable. If the lamp parts are combined, the lamp will be unbankable, and the lamp must be used or kept in inventory. Players will gain experience in Construction, Defence, Herblore, Mining and Woodcutting when they rub the Ghul lamp.

This lamp can be combined with the four other Genie lamps as well as a bottled genie, to form the Lamp of the Djinn. Experience from this lamp is roughly 25% more than the xp of a medium XP lamp in your chosen skill, and roughly 50% of a small XP lamp's xp in the other 4 skills. Parts for all 5 base lamp types are findable while skilling or in combat. While the parts for these lamps are not sellable or tradeable in the normal sense, they were made exchangeable in a face-to-face trade with other players for an equivalent number of lamp parts. To trade them there must be an equal number of lamp parts on both sides of the trade, and no money or other items in the trade at all.

Trivia

 * The word "ghul" refers to the Arabic word "غول" which is pronounced in the same way, whereas "ghul" means "ogre" in Arabic.