With brimstone slayer being so profitable and making slayer in general extremely popular again, the catacombs have become near impossible to slay in efficiently as an an iron or UIM, and are even very frustrating to do as a main. On an iron, anyone can wait for your monsters health to get low and just tag it for the kill (happens way too often), or simply just put their cannon down and make it near impossible to finish your task.   The solution: Instance scrolls that must be bought with slayer points. There's an incredible amount of people with 10k+ slayer points that have bought out the shop, so this would not only give them a use for slay pts, but it would give an extra reward to slayer. The instance WOULD NOT be for the entire dungeon, however, just for the area where your currently assigned slayer monsters to keep the server from being overloaded. The one big thing that would need to be different here vs other instances would be to either allow cannon, or have the monsters aggro, to make near par with the regular dungeon.