This list doesn't have any Mandrakes? It's venom spam with reavers and Reapers.
Cut the Sybarite and promote a reaver with a CC to Arena Champion. All the best Warlord traits in every list we can access are CC focused. Since you promoted a character for no other reason than to be warlord, might as well make it someone who actually benefits from being the warlord.
Otherwise: NO characters, Cut 1 Reaper, and downgrade Raider kabalite blasters to shredders, for a Void Raven with dark scythes, and make that your warlord. If you downgrade all of them use the 20pts you have left over to turn the first CAD's HQ raider into a venom with SC, the first Medusae into a Lahmian, and up the number of Medusae in the second CAD's court to 2.
This change trades 3 blasters, a reaper haywire cannon, and a disintegrator cannon, for 2 Dark Scythes, a voidbomb, 2 splinter cannons and 3 shredders. 2 ap3 flamers in the same boat is more than twice as good than 2 disparate ones in most cases.