Any weapon that has a great crush bonus:
Battleaxes
Maces
Mauls
Warhammers
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The best monster to kill with crush is earth warriors and it levels you up fast. in the edgeville dungeon it's in the wilderness so watch out for revenant imps they can hit up to 23.
The best monster to kill in Runescape would be the King Black Dragon.
You're going to need armour and high combat stats. You're not going to kill a frost dragon with a bronze dagger and your rubbish bin lid at level 3. Sara Brews are recommended and a decent weapon like a Barrows weapon or even a Godsword. An Abyssal Whip is not recommended but it can be categorised as a decent weapon depending on the enemy. I'm not an expert at frost dragons because I buy the frost bones, I don't kill them for it.
Black Demon Weaknesses:Darklight (Weapon)Silverlight (Weapon)Holy waterCrush attacks (Mace, Battle Axe, Great Axe, 2h-Swords)Slash attacks (Longsword, 2h Swords, Daggers, Short Swords)Magic attacks
He is easy to kill only level 20, you have to be a woman in Runescape to get to him though, my guesses your doing the recruitment Drive Quest.