*There is an increased chance of obtaining this drop and in a higher quantity while on an Spiritual mage Slayer assignment.
Spiritual mages (Zamorak) are ghostly followers of Zamorak which are only found in Zamorak's Fortress across the broken bridge in the northeast section of the God Wars Dungeon. 70 Constitution is required to jump the bridge and your Prayer points will be drained after doing so and therefore bringing at least 1-2 Prayer potions is required if you wish to use prayers while fighting them.
As long as you are using Ranged and have a Zamorak item or Shard of Zaros equipped to prevent aggression, these mages shouldn't pose too much of a threat to most players and can be easily killed.
The chance of receiving better drops is increased by the Ring of fortune, Enhanced luck potion, Collector's insignia (charged), or Luck of the dwarves.