All Slayer Masters have an equipment shop where they sell items related to Slayer tasks. These items are useful, and in some cases, necessary to complete specific Slayer assignments.
Slayer Masters are NPCs who assign tasks to players, requiring them to kill specific monsters a certain number of times. Each Slayer Master has a combat level requirement before players can be given a task from them (some additionally have a Slayer level requirement). Generally, Slayer Masters with higher combat level requirements will assign more difficult tasks. Completing tasks will award experience and Slayer reward points, which can purchase rewards, upgrades, and unlockable items.