If you're able to have 90+ attack and RS gold strength, then melee could be the best choice. Ranged setup though would go something like this... Equipped items - Neitiznot (for the prayer) and defence bonus), any boots you want (ranger or snakeskin might benefit the most though they are followed by bandos or White for praying),
Method to stand directly in front of them, protect melee and use eagle eye. They'll probably melee the majority of the time as your d'hide / armor will block most of their magic strikes. The only damage you'll suffer mostly is their ranged attacks.
I believe, first foremost, you have to construct a throne area as well as an upper floor on top of it. And then create an oubliette space beneath it. Additionally, you must construct an entrance trapdoor in the room. Then, there are cheap OSRS gold two ways of getting into it It is possible to build a huge cave entrance, which you build within a garden or fancy garden. A flight of stairs in the space.