I just started it and I'm getting ready to fight damis. The tipit quest guide makes him sound really tough. What attack style does he use and what sort of setup should I be using?

He is very simple get some prayer armour and pray melee and fight with mage

snare him and mage him with protect prayer, its easy

You want your armour to be a good magic/prayer bonus mix. I just used the best earth spell I had along with melee protection prayer, without bothering to snare. My inv was full of prayer potions and a few sharks; you could even take a magic potion or sip it at the bank. He drains your prayer points fast, so you might want to side step while you drink prayer potions, like you would if you were barrowing.

 

 

 

Last tip. He has two different forms. What I did was kill the first, teleport out and restock then enter and kill the second. It might make things a little easier during the second, harder form.