I've done a fair amount of solos I usually just pot where I stand, unless Kree is trying to melee, if that's the case I run away and pot. It's pretty straightforward, try to either get Kilsa (Melee) between you and Kree so he can't melee or just run away when he trys to melee. Use Rubies for the first 1/2 or 3/4, which ever you prefer then switch to Diamonds. After he's dead I kill the minions in this order; Melee, Mage, Range. (I never take Range prayer off, if you try to put it on when he spawns your most likely going to get hit for 40+) Also I'm going to go on a solo trip when I'm done eating, if you want to watch you're more than welcome to.