oh whoops, I thought he was a sorcerer lord... In which case... why dont you have a sorcerer lord? This way you have no magic at all, and without that +5 to dispel his slann will completly dominate your army with magic, Chaos Lords are the best meele characters in the game but I think with a chaos army you will need a sorcerer and if you give your sorcerer Lord the same set up as your Lord except with 3rd eye and conjoined homunculus then he will be just as effective in combat as an Exalted Hero, who can take on a scar veteran without worry especially with that 2+ armour and 3+ ward.
When life gives you lemons..... BLOOD FOR THE BLOOD GOD!