Destroy

From the RuneScape Wiki, the wiki for all things RuneScape

Destroy is a feature in RuneScape for certain quest-related items, discontinued items and holiday drops that replaces the usual "Drop" option available to all other items. These items cannot be dropped, and can only be destroyed. This option was most probably introduced by Jagex to prevent players from obtaining multiples of the same item. Before being destroyed, a text is shown as a final warning to players. When destroyed, these items may (or may not) be obtained again from the place where they were previous located.

Destroy is also a parameter for the Template:Infobox Item.