Staff of darkness

The staff of darkness is a two-handed staff that requires 85 Magic to wield. When a combat spell is cast with the staff, there is a chance that the staff will negate the rune cost for that spell. This is the same 12.5% (1/8) chance as its lesser counterpart, the staff of light. Just like the staff of light, the staff of darkness can be used to cast the Slayer Dart spell.

Making a staff of darkness requires combining a staff of light with a wyrm heart. Creating the staff leaves it with 50% charges remaining; using the staff of darkness with another staff of light will recharge it by 50%. The creation process can be undone, although only the wyrm heart will be salvaged. The staff will last 10 hours in combat from full charge, and will revert to a wyrm heart once it runs out of charges. This creation/degrade mechanic is shared between its combat triangle equivalents, the Strykebow and the Lava whip.

The price to create a completely charged staff from its components, a wyrm heart and two staves of light, is. The price to fully recharge the staff at current Grand Exchange prices is.

Special attack
The staff has a special attack that when used, both absorbs and reflects 25% of all incoming damage for the next 20 seconds, requiring 100% adrenaline to use.