Slann BSB (Lore of Metal) Focused of Mystery Focus Rumination Bane Head Dispel Scroll Cupped Hands 16 Temple Guard, with full command War Banner 2 EotG Wardrums, Tepok, 2 Dispell Scrolls 18 Saurus Warriors 2X10 skink skirm 3 Razordons with extra handlers He usually splits between Nurgle and Tzeench casters, he might go all Nurgle. The Razordons are going to be going after his hellcannon if he takes it and holding the flank if he doesn't. I know he will be bringing at least one unit of 15-20 warriors (im expecting two blocks) and a base unit of knights. He runs Nurgle with his combat troops and Slaneesh for his screens of flanking units (he loves the mauraders with great weapons) I don't know how many dogs he will bring as skinks take care of them fast, but he might bring horsemen eitherway, not to worried. My plan is to out magic him and clean up with combat res and impact hits.
What lvl are the priests? I like the list. If the marks haven't changed since I last played chaos then only undivided models are immune to psychology so cause terror tests all around with your stegs. I would add a march blocker instead of the razordons though. They aren't going to do much to the armor and you can add chameleons or terradons instead.
slaanesh is ITP now.... allmost it only makes them immune to panic, fear, and terror so he can still flee from the charge. chaos doesn't have great Ld tough so terror will be nice