This is how i got it in mind.
Hive and fallen got their militant renegade and rogue.
The plan they got is to take over our landing zones on a planet of interest
Example.
An unknown hive demi-god scatters like yellow bar ogres around titan.
They defend with an army ofcourse ,summoning spots for more allies to join them.
Enemy stronghold A:
100 enemies
5 mini bosses
Enemy stronghold B:
30 enemies
1 mini boss
Enemy stronghold C:
360 enemies
24 mini bosses
After doing that the demi god spawns.
Communications disables.
Modifiers active.
Vanguard grant unlimited\limited amount Tanks.
Loot Suggestion:
Emblem.
Quest items.
Tainted weapons and gears due the demi-god presence/aura.
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Sounds a little bit like Invasions on Warframe, which aren't a bad idea.