how would you be good OSRS GP in the art of prayer switching? If they're attacking with melee, and then they unleash, you must make a guess as to whether they are attacking from range or mage. if your guess is right then it's good but if it's wrong then you are likely to be in danger before you switch again... Correct me if i am wrong... it's just the information I read in guides but never visited there or done the quest.
This is how I do it. There's a pattern to it and they don't change their attacks randomly, right? The truth is that it's not. It's the fact that they do not hit with melee anyhow which is why it's better to rely on magic or range. When they're about to start ranging, when they begin to roar, a bone shard will pop up moving upwards however it could be a little tricky to spot at times. Watch out for signs that the demon's been fighting.
In slayer tower, you'll crush them quicker with melee, so if you want go with this option. Armor is the best protection against magic (Attack is melee, but its defense is based on magic, so d'hide and the like) or in the event that you're inclined to pray (Bit of an unnecessary expense unless you're fighting the mutants with cannon) then you should use the best prayer defense and pray to protect melee. For weapons , use your most effective slash weapon.
Personally, I would prefer range buy 2007 runescape gold as they're fantastic for range xp since they're basically giant meatsacks. There are also a lot of semi-safespots inside the slayer tower to range them from.