Basic Outline, modified from the original 8e incarnation because of blast weapons:
2 Canoness (free miracle die and for the Save Buff, re-roll 1's is a given), Palatine re-roll of wounds, Celestine for the 4+ invul buff, Missionary attack buff.
10 Arco Flagellents: because forcing 46.5 saves at -1 AP against T4 is in fact good against every single thing. Transhumans will still take 35 at -1. Still epic. That they are two wounds with FnP is also pretty boss. Glassy but effective.
5 units of 10 Sisters of Battle, all with 3 Meltas in each squad. 15 meltas in all. Obsec. 8 Bolters per unit, 5 units means a lot of overall dakka to throw as long as Sacred Rites and character buffs hold. ULTRA tough with the Valorous Heart buffs. Free Simulacrum Imperialis for the win! Stratagem will allow them to fall back and shoot so you can shove them forward and let happen what may.
2 Exorcists: Range and distraction. It is extremely helpful to have reach on your opponent and it makes the opponent nervous until they are gone. There are very large scary things in this world that must be taken down to size early, or else bad things happen.
Multimelta Retributors: hard to beat the firepower. Well, it's actually impossible. Throwing 12 +1 dmg 36" range multimelta shots turn 1 is kinda silly and an excellent deterrent.
Imagifier: because ignoring up to -2 AP is suh good.
Seraphim with Fusion pistols: Gotta be able to get to the backfield for Scramblers. Also great for hunting.
Dominion: Speed Bump deploy shenanigans to stop units from otherwise overrunning you too quickly. Form them up in a wide bubble and force the enemy to move around or through them round 1.