Staff of light

The Staff of light is a unique drop from Ice Strykewyrm. It can be used as a slayer staff, has stats roughly equivalent to a dragon weapon, causes +15% Magic damage, has a special attack that reduces any melee damage that is received by 50% for one minute, and has a 1/8 chance of not using up runes each time a damage-dealing spell is cast with it.

The rune-saving effect can be combined with a full set of combat robes (improving the chance to 1/5) or battle robes (for an impressive 1/2 chance of saving runes). Also, any time the staff does not save your runes, the robes themselves will still have their usual chance of saving you any mind, chaos, death or blood runes used by the combat spell you are casting. These robe sets can both be earned as rewards from the Fist of Guthix minigame.