Mindspike

The mindspike is a changeable version of the standard staves: the Staff of air, water, fire and earth, but has a higher accuracy. The mindspike (air) can be obtained as a drop from killing Magic Stick during the Troll Warzone tutorial, or after as a drop from killing Troll shamans, which are in the east portion of the Troll cave north of Burthorpe.

The staff will provide unlimited runes in whatever element it is set to. You can change the element of the mindspike by right-clicking on the item and selecting "Change element". The staff's current element is shown in brackets at the end of the item name (e.g. Mindspike (air)). You can change the element back and forth with no tangible limitations. This can be handy as you don't need to bring all the different elemental runes to have all the teleports, instead you can change the mindspike's elemental rune to the elemental rune needed for the teleport or spell. This way you can save a lot of inventory space (note: it takes longer time to teleport this way).

Note: If you want a second Mindspike, you must change the element of the mindspike to any element other than air. Even if there is a Mindspike (air) in your bank, you cannot receive a second mindspike unless the element is changed. Once a second mindspike is dropped, you can change all mindspikes to any element so that they may stack in a bank.

Mindspikes of different elements will not stack in a bank, however Mindspikes of the same element will.

(You may however pick up a second Mindspike (air) as an unwanted drop by another player.)

Before the Evolution of Combat this weapon used to have a special attack.

Glitch
On 10 February 2012, a glitch involving the use of a mindspike staff allowing any player wielding one to hit a 50 on any NPC, pet, and every player with it. The NPCs would always drop bones. The glitch occurred after the Burthorpe graphical update, but was first discovered on 10 February, and hotfixed less than an hour after its discovery.

This glitch was widely used in pranks by players to kill other players' pet cats. This would cause a player to lose their cat on death, meaning they would have to get another kitten and raise it back to 100% growth. However, it would not cause other pets to die; they would simply spawn bones on the ground and not vanish. The glitch worked by clicking the special attack bar and then casting any combat spell on an NPC that was previously unattackable. Bankers, familiars, and random event NPC's could all then be attacked in this fashion. Due to this glitch, it was discovered that most non-combat NPC's have 1 life point. This glitch was also used to temporarily break bots, by killing the Dungeoneering banker.

A few non-combat NPCs, like cats, would attack back using this glitch. This is likely because cats are able to fight in the Ratcatchers quest, so have an amount of life points set by Jagex.