By destroying a good portion of their main fleet,
I don't think this is going to happen to any meaningful extent. Not while leaving us many ships left over to harass with later, and I'm not terribly worried about conventional bombardment. We should be able to harass the enemy to a snowball-effect over the time it'll take them to get through our shields and armor, especially with ground-side fire support.
...If we're planning on counter-attacking Valinor, eliminating their fleet is a priority.
The Avernite fleet isn't going to do that on it's own. We'd need the orbital and planetary support to do that kind of damage, and they'll not stay in battles that go that badly for them. Not until they're desperate.
will be in the void where all the ritual sacrifice will be taking place.
At least they'll need conveyors to pull off any big rituals in space.
We should get one thing clear: Are we waiting for the Trust Fleet to come to the rescue?
Because if we do, we absolutely need to hold the void over Dis. Because as soon as the enemy sees Vanaheim coming into the system like the Rohirrim over the hill, Valinor is just going to sail straight down at Dis with every ship they have and the kitchen sink.
And if we don't, we still are very unlikely to get any good exchanges if we push the naval battles here and now. It's in the harassment our strength lies, thanks to Ridcully and Sarnow, that's where we can get the best exchanges. What our orbital defences can do is discourage our enemies from going into certain battles, like a battle for the void over Dis.
And we need to keep the enemy from orbit over Dis, because battleship kamikaze is the greatest threat.
Ground combat is our strength, not the void, we don't need to worry over the ground beyond the Big Angyl. And we can disrupt those rituals on the ground, and unless things change dramatically, we'll have time to target the enemy conveyors in harassment (over multiple harassment phases), and the conveyors are the only transports big enough to sacrifice billions on. And lastly, the conveyors are the other option the enemy has for dropping on our cities, besides the battleships, and they can be dropped with Angyls on board.
What we are extremely unlikely to dent on our own are the big demonic battleships. So Kamikaze is the more plausible MAD threat to us.
So I would suggest something like Bleeding Fleet, but with the Conveyors as the secondary targets of opportunity instead of the leadership, because the conveyors are more vulnerable than the battle barges the leadership is stationed on, they're where the enemy Titans are, and the conveyors are necessary for off-planet Angel summoning. We don't even have to destroy them right away, just damaging them for easier kills later helps just fine against phase MAD.
