He is level 108 with 450HP, which makes it a little struggle to kill. During the fight, guards may enter the space and strike you. When he's dead, then speak to the Hostage, and RS gold climb out the window and then run to the exit, with numerous level 35's ranging you. There can, at times, be around 20 guards attacking you, so be cautious and fast.
Expertise (This isn't, I repeat not a fantastic method of gaining experience as you may notice you will only be gaining 1/8 of this normal experience as you normally do [4 Exp * 1/8 =.5 Exp Per Damage]) The fantastic Sides (Not many but hell who cares?) Drops( The critters will drop at the exact same rate they always do, and yes ring of wealth will still have an effect on drop rates) Bank (You may build a financial institution booth in the begginning of this dungeon.) Experience (If you are patient enough I guess that is alright for expertise, it would drive me insane though.)
Slayer (This will still count as a slayer job, however please note if you want to add a slayer monster into the dungeons you must have the correct Slayer Level to add and kill the creature [Ex: 85 slayer to kill and add Abby Demons])
The Agility Clause: The reason you should have at least 20-70 agility is since you MUST add an agility trap in the begginning of the dungeon, this is because you don't need the critters on your dungeon to escape and destroy your house. Also note you will Buy OSRS gold gain expertise in agility equal to the level necessary to jump the trap multiplied by 10, but that it is only going to provide expertise once per 5 minutes.