Slayer's staff

The Slayer's staff is sold by Slayer Masters. It requires level 50 Magic and level 55 Slayer to wield and is required for the Magic Dart spell.

Many people use it as it is one of the requirements to cast Magic dart. This makes it useful for doing the Barrows activity and killing Dagannoth Kings. This staff can be used to autocast the Crumble Undead spell, the Magic Dart spell, and the four Wave spells. Finally, it is the most powerful (in damage/minute) weapon for level 1 in Attack, so it is a popular choice for obsidian maul pures in the making (if they have 55 Slayer and 50 Magic).

Trivia

 * During the Draynor Bank Robbery tape, 1337sp34kr, appears to be wielding a Slayer's staff.