At low health, Skru might flee instead of dying, so you could always keep on trying until you see him do it. I beat the fight at level 15 (with grenade and best possible equipment), so you might stand a chance.
Viewing post in Lust Odyssey (NSFW Visual Novel) comments
I beat the warlord with no one's dying and by lust soo it's a win win HAHAHAHAHA XD and yes i didn't use the smoke thingy for him because it makes him weak and i don't like that HAHAHA btw mr. xper made the warlord soo hot for what so we can take his anger and free him or destroy him but for me I've free him ;} NO QUESTIONS HAHAHAHA XD