So going to do a crusade starting at 600 points. I haven’t used my Tyranids in aeons so the thought is this:
One especially large trygon prime(pic rel) and some friends digging around under Armageddon eating biomass and generally causing a ruckus, vanishing quickly back under. Due to the rampant chaos happening all over the planet, this subterranean force has dwindled until only the biggest and cunning ones are left.

So the gimmick is this: packing a carnifex gang. Sucking them up to reserves t1 for 1cp, t2 they bust out along with the trygon, but “6” away . Everyone gets reroll to charge for 1cp.

Of course I haven’t read the Armageddon crusade book yet, only the review by g**nh*mmer , how many of the scenarios block deepstriking/reserves outright?

Anyway so here’s the goofy list: 600 points starting. Subterranean assault detach.
Warlord: Trygon Prime- -prime enhancement.
alpha strain carnifex (Old one eye)
2 carnifex with deathspitters, ones got crushing claws the other has Talons.

A biovore.