I did like 30 vorkath kills, its not even making any money if you use bones for yourself. And its not as flawless as OSRS, so having 1m price for that is too much
I noticed, that you cant get zuk assigned on task.
Ive unlocked Tzhaars, got them as task and if you speak with slayer master again, you get jad as a task, but you catn get zuk.