I think this extra defence (DFS and such) will only be required for Elite Runite Dragons.
Where Dragonbane ammunition still stands for all versions of Adamant/Runite dragons.
I wouldn't want to have Greater Demons on a blocklist intended for casual slaying. Kril Tsutsaroth for a Greater Demon task is not too bad xp, the chance to get a few drops, and less boring than a lot of tasks.
Orton
said
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Not sure if you can answer this but is there like an average amount of vip tickets used per hour for the most xp?
With the current prefer list - you have 61% chance of not receiving the desired task in the first choice, and in the second choice (the vip ticket) the chance of receiving the desired task is increased slightly (~3%) because it cannot have duplicate task as the first choice, so about 42% chance to receive the desired task in vip ticket.
Each task usually takes 30 minutes on average i.e.
Dark beasts ~24 minutes
Airuts ~28 minutes
Waterfiends ~29 minutes
Celestials ~40 minutes
So you ask Morvran to be assigned a task 2 times per hour.
So you'd use 0.5124 VIP tickets per hour. If you have a stock of 60 vip tickets, it should last you for over 110 hours of slaying. Easily 25m+ slayer exp right there.