I thin you should turn the DP into a normal chaos lord and give him terminator armour, it's cheaper and you can take off D. armour and D. aura, better replace those by D. strenght and D. essence also dump the D. flight and let him join a unit in a rhino
also suggest you take nurgling infestation, make the lord great for taking out large units.
Try also adding D. visage, he is fearless, so you both stay in combat or he flees
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