Slayer/Task Extenders

Slayer Task Extenders are items or effects that while active will lengthen or shorten your current Slayer task. Some monsters can only be killed while having them assigned as a Slayer task, and when players are hunting for their unique drops they may use one or more of these items to get more kills from one task. However, when players do not like their current assignment they may want to shorten and use an item to end the task sooner.

Modifier	Cost	Duration	Effect
Headhunter's sacrifice	715	It holds 25 charges.	While wearing the bracelet, there is a chance that a kill on a Slayer task will count as two kills, granting no additional experience. Using this on a Slayer task will reduce the Slayer points earned upon completion of the task.
Headhunter's thrill	1,722	It contains 25 charges, and charges are used only when the effect occurs.	While wearing the bracelet, there is a chance that killing a monster on a Slayer assignment will not count towards the Slayer counter, but experience is granted.
Co-op Slayer	Requires 1 other player	While having the same task as your partner	When participating in social Slayer your partner can reduce your Slayer task for every kill they do, and vice versa, helping you complete the task faster. Reduced Slayer points but you gain Co-op points.
Extend assignment	30 Slayer points per task	Once per task	Extends the player's amount of monsters to kill on that task by 20% based on the initial number of monsters, it does not provide extra Slayer points. This also stacks with the 20% gained from having the assignment preferred.
Prefer assignment	100 Slayer points per race	Once per task	If a player is assigned a task that is on their preferred list it is automatically extended by 20%.
Trophy-taker's perk	Gizmo creation + cost of items for components	Infinite while Charge pack is not empty	3% chance per rank a slain creature will add zero kills to its Slayer assignment; 2% chance per rank it will add two kills. (Rank 1-5 possible)
Dedicated slayer aura	5,000 Loyalty points	1 hour	Gives a 3% chance that your Slayer task count will not be reduced when killing your Slayer target.
Greater dedicated slayer aura	21,000 Loyalty points	1 hour	Gives a 5% chance that your Slayer task count will not be reduced when killing your Slayer target.
Master dedicated slayer aura	54,500 Loyalty points	1 hour	Gives a 7% chance that your Slayer task count will not be reduced when killing your Slayer target.
Supreme dedicated slayer aura	115,500 Loyalty points	1 hour	Gives a 10% chance that your Slayer task count will not be reduced when killing your Slayer target.
Legendary dedicated slayer aura	234,500 Loyalty points	1 hour	Gives a 15% chance that your Slayer task count will not be reduced when killing your Slayer target.