Well, train range if you havn't already. Bring dragonhide armour (if fighting a mage) addy arrows, a decent bow, and a rune two hander. Here is the tactic, (make sure you're right up to them) first, get him down to about 20 hp (assuming you can hit 20+) then right after the arrow switch to a rune two hander for the ko. If fighting a warrior, bring a full rune with the scimmy and a two hander. Make sure to get him to pretty low health before you unleash a blow with the rune two hander. (this use almost useless unless you're fighting a pure, there's like a 5% change you're going to get a ko in free to play). Fighting an archer, either use the tactic with the mage (d-hide, a bow and arrows, rune two hander for kill) or bring a warrior outfit and hope for some good hits. Hope this helps. :).