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I want to have options to fight against the following:

Can I stop a Flare Shielded Spartan/Malcador or an Ionic-Flare Shielded Knight?
Can I survive an army with 6+ Phosphex Quad Mortars?
Am I mobile enough to take objectives?
Can my list survive contact with a Primarch or Leviathan?

I also wanted to emphasize Leadership debuffs for the opponent.

Erebus
Zardu Layak
Mhara Gal with Warpfire Plasma and Tainted Power claw
Deredeo Dreadnaught with Aiolos missiles

2 Laser Destroyer Rapiers

5x Gal Vorbak, Dark Martyr with AA and PF, Drop Pod (With the debuffs, Im thinking alot of units will be pinned).
5x Meltagun Support Squad in Pod
10x Tact Squad, SGT with AA and Melta bombs in a Pod
10x Tact Squad, SGT with AA and Melta bombs in a Pod
10x Tact Squad, SGT with AA and Melta bombs in a Pod

Enemy units within 12 inches of Erebus use their lowest leadership value
Aiolos missiles force pin checks
Mhara Gal's Plasma cannon forces pin checks at -1 and his fear checks are at -2
Each pod in this RoW forces a pin check when it lands
and the Gal Vorbak and Layak are demons also forcing fear checks checks

Can Layak ride with Erebus or does his demon status prevent?

Layak will chose Summoning, Cursed Earth and Incursion to get some demons on the table.
Erebus will select from Biomancy.