Void staff

The Void staff is a degradeable two-handed void weapon and considered to be one of the strongest magic weapons in Gielinor. It provides the user with an unlimited amount of air, earth, water, fire and sun runes. In addition to this, it has a 60% chance to save a rune while casting a spell and 20% chance of saving 2 runes while casting a spell. After 10 hours of combat, the staff fully degrades to dust. The staff can only be obtained as a rare drop from the Void dragon. The staff also has a special feature, by write-clicking on it, while it is in the inventory a player has the option "Camouflage". This feature disguises the staff to make it look like a Staff of air, Staff of water, Staff of fire or a Staff of earth, so other player are unaware that the player is wielding a Void staff. The staff requires 95 Magic to wield. As with all void weapons, it deals 30% more damage to corrupted monsters, so it is extremely useful in the 3rd and above floors in the Tower of Void.

Special attack
The Void Staff has a special attack called Stat Leech which takes 100% adrenaline. The special attack fires the selected spell at the opponent. If the opponent is a player and if the attack successfully hits, then all of the players stats are halved(if the opponent has an overload active, then its timer is halved) and disables the opponent from drinking a dose of overload for 2 minutes. Otherwise, if the opponent is a NPC and if the attack successfully hits the target, then its offence and defensive stats are reduced by 20% for 20 seconds. It doesn't matter how much damage the spell does, as long as it doesn't miss it will apply the special.