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 only 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).
Requires 240 Telekinetic, 240 Alchemist, 2400 Enchantment and 240 Graveyard points, and a teacher wand equipped or in the player's inventory, to purchase from the Mage Training Arena. Thus it does not cost much besides the time and runes spent in the Mage Training Arena.
Has a special attack that halves all melee damage the player takes for one minute, which stacks with the PvP damage reduction effect of the Protect from Melee prayer. This consumes 100% of the player's special attack.
When a combat spell is cast with the staff, there is a 1/8 (12.5%) chance that the staff will negate the rune cost for that spell.
Currently the strongest staff when used as a melee weapon, surpassing the Ancient staff and Iban's staff, and provides +17 magic defence.
Has its own built-in spell, requiring charges which cost 115 runes and 10 coins per cast. Can hold up to 2,500 charges.
Built-in spell damage scales with the player's Magic level and can hit up to 28 at 99 .
Has a weapon speed of 6 (same as scimitars/whip), while all other forms of combat magic only have 5 (same as longswords).
Because the spell is built-in, the player does not need to carry its runes in their inventory and can use Lunar spells or Ancient Magicks while wielding this staff.