I was literally going to write this as a suggestion the other day I support. I'd like to put some ideas in for this
1) This task should be 20kish exp considering how long it takes to do a raid.
2) I think roughly 10-20 slayer points per task would be ideal for this suggestion.
3) If you're on task for the Slayer helm (I) and Dragonhunter crossbow to not stack it would devalue the twisted bow because of the damage increase you would have if they were both stacked (similar to salve ei and slayer helm I not stacking)
4)To combat leeching at olm because that would obviously be a bit of a problem you must deal a certain amount of damage on Olm (Perhaps 2.5-5%)
5) To be able to do a raids task you must have completed at least 1-5 raids
But in my opinion this would revive raids because slayer is most peoples favourite skill and would give motivation for people to raid more (Like me with being dry of tbow).