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Supreme Command
Roboute Guilliman

HQ
Uriel Ventris
Chief Librarian Tigurius

Troops
10x Intercessors w/ Autobolt Rifle
10x Intercessors w/ Autobolt Rifle
5x Tactical Squad w/Storm bolter & Heavy Bolter

Elite
Primaris Ancient w/ Relic Standard (+1 Attack aura)
Primaris Apoth w/ Seal of Oath
2x Vitrix Honor Guard

Heavy Support
10x Devastator Squad w/ Cherub + MM 4x
10x Devastator Squad w/ Cherub + Grav Cannon 4x
3x Eradicator w/ 1x MM

Adding Ventris to my army in place of Cassius who typically does well but I feel Ventris is more versatile.
He gives CP efficiency on Adaptive strategy which is just fantastic for big units of intercessors and devastators plus he is quite capable in melee himself. Plus an additional reroll 1's aura in your list never hurts.