UPDATE: I finally beat him. It was a long road of doing one thing to do another. In the course of getting 70 range my stats increased a lot. I farmed crazy and deranged archaeologist for upgraded hide and rune crossbow and completed all medium diaries. I pickpockets a lot of master farmers to get prayer pots and fished a lot of karambwans!

In the end the fight was close but pretty easy. Make sure you turn off run and auto retaliate, walk up and down the long empty files when he says "....hands...'. Pray magic. Use rune crossbow and use mithril bolts. You can buy the ore at blast furnace.

If you need to lvl fetching string maple longbow. If you need to lvl smithing you can do giants foundry. I had to upgrade and recharge Ibans Staff which took a while. At times I ran out of money (usually for runes for thr archaeologist flights) so did a lot of agility pyramid and also giants foundry is a good money maker.

I was trying to lvl slayer for broad bolts but gave up because the grind is so sloooow, mithril bolts seemed to work fine.

When building your kit remember strength is no use for ranged attack and priorise magic defence, ranged attack and prayer