How would you fare at praying? If they attack with melee and OSRS gold then start to are roaring, you need to decide between range and mage. If your guess is correct then good. If it's not, then you're likely to suffer damage before switching... Let me know if I'm incorrect... it's just what i read on guides that i haven't visited there or even done the quest.

That's how i do it. It's a pattern, and they don't just switch their attacks randomly, right? Nah it's random, it's only that they don't attack with melee all the time It's much better to believe in magic or range. If they're in the process of expanding, as they roar, a little bone shard will pop up and then move upwards, although it's a little tricky to spot often. Be on the lookout for it if the demon's just been meleeing.

At Slayer Tower you'll crush them quicker with melee so if you're after, take that route. Armor is the best protection against magic (Attack is melee, however its defense is based off magic, so d'hide and the like) or when you're feeling like praying (Bit of useless unless you're fighting the mutants with cannon) then you should use the best prayer defense and pray protect melee. When it comes to weapons, you should choose the most effective weapon for slash.

However , I personally would recommend range since they're quite amazing with range xp, which is essentially giant meatsacks. There are also a lot of semi-safespots within the slayer towers that can be used to separate them from.

Since you'll be trying to keep them out of sight (Getting them caught in blocks, piles of rubble and such since they take up 2 squares) look for buy RuneScape gold the top range equipment, including archer helm/robin, the best dragonhide, snakeskin boots/ranger.