I won’t comment any special rules at the moment, instead I’ll look at the list:
Sorcerer Lord
O Very rare I think to show two very different profiles between levels 3 and 4..? Are there some typos in there?
O I wouldn’t make it compulsory to take a mount.
O One wound for the palanquin seems a bit strange to me. I know they did it with the nurgling one, but it hardly seems worth taking just as a 1W mount.
O For the sake of simplicity I’d call the palanquin bearers something different. I doubt they could wear immortal armour and carry it anyway.
Chaos Dwarf Lord
O Combat monster! A little too tough considering he can have magic weapons/ armour.
O Daemon forged Armour should be an upgrade.
O Give him a blunderbuss upgrade option
Bull Centaur Lord
O Daemon forged Armour should be an upgrade.
Chaos Dwarf Hero
O Should be T5. I’d make him BS4 as well.
O Daemon forged Armour should be an upgrade.
O Give him a blunderbuss upgrade option
Hobgoblin Hero
O I’d make him 50pts
Priest of Hashut
O I’d make him A2 and S4
Daemonic Engineer
O Drop the Daemon forged Armour, he shouldn’t really be a combat hero.
O Give him a blunderbuss upgrade option, maybe a pistol as well.
Warriors
O Change unit size to 5+
O Having all warrior units capable of having a magic standard needs looking at more.
Hobgoblins
O Change unit size to 5+
O Increase to 4pts each (because of poisoned attacks), and increase strength to 3? (Interesting idea that), or keep it as is with no changes.
Bull Centaurs
O No restrictions on cavalry in a chaos DWARF list is unbalanced, needs looking at.
O Move great weapon and shield to upgrade options, along with additional hand weapon. Because of impact hits I’d probably keep the cost at 22pts after removing those.
O Not sure a Boar Centaur is a promotion???
Immortals
O I’d increase pts cost to 15 at least.
Bolt Thrower
O Increase hobgoblin crew to 3.
O Clarify if the Poisoned Attacks refers to crew or warmachine .
Death Rocket
O Could you have the Daemonic warmachine as an upgrade?
Earth Shaker
O Could you have the Daemonic warmachine as an upgrade?
Tenderiser
O Because of the movement I’d keep this as 1 rare slot.
O Drop the ward save
Kollossus
O Not sure about this one. I can see what you’re aiming for, but I think you should either do ranged attacks or close combat specialist. To do both means his points cost should be more like 400pts.
Overall I think this list needs more balancing, especially the cavalry and warmachines. There’s not enough core or special choices, and I think you need another hero.