Skink lord needs to have a new kind of mount, basically an extremely fast lizard of some sort, with a movement of 10. Only the skink lord would be able to control such a quick and powerful beast. Also it would be -2 to hit this guy, due to lightning reflexes. For shooting, he'd be able to spit venom at 18 inches. The venom attack would be D6 shots at strength 1 BS4, but any rolls of '6' to hit auto-wound as normal for poison. No armor saves can be taken against this attack and each unsaved wound multiplies to D6 wounds! Sort of an all or nothing poison spit to the eyes sort of deal, best used against big multiwound critters.
The mount would have 4 x str 5 poison attacks at very high initiative, do D3 strength 5 impact hits, and a single strength 5 stomp.