hi im jagex and today i will show you the jad guide
Requirements
99 range
99 prayer
and lvl 138 to start off you need to be ranger get 99 range and dhide armor or armadly and rune c bow or Chaotic cbow
(Guys i had the wrong boots.) 
now your inventory now what is good that they hit nothing on you unless you have prayers and also you need saradomin brews for when the range and mage hit you these are important. also a melee weapon like a dragon dagger or something else is needed from wave 1 - 10 after that you do range
now you need to get there , go to the quest tab and click teleports and click more options till you find fight pits.

now when your there you need to make your way to the fight caves here is a map you need to go from the yellow arrow to the blue.
now you will see a cave go in it once your ready and there is a bank there.

now once you are in there will be a message , you may already know this.

now at round 10 go to the safe spot which is located south-west.
you will see a wall/place like this..

now trap the monsters behind that pillar and attack them if they spawn near you just try and get them behind it

Hoped this helped
- Jagex