Before you say I am stoling this idea, let me explain you a thing. By now most folks have figured out that Fateweaver and the Grimoire of True names is a pretty good combination for us cheeseballs. So let's take that idea and develop it into a strategy.
The trouble with Bloodcrushers is that they're easily dispatched by missile launchers. But nobody brings those anymore because they're all packing plasma guns and autocannons to strip hull points off vehicles. Then again, somebody might. The Grimoire gives you a 67% chance to not die to the rocket, and with three wounds to their name, a 3++ save is a hell of a thing for something as potent as a Bloodcrusher to have as anyone who has fought Necron Wraiths can attest. You also have a 67% chance to activate the Grimoire without hosing over a unit. Fateweaver bumps those odds up to 90% with his Tomorrow Stick.
Now, then, somebody has to tote the book, and since I'm not about tons of HQ choices, it had might as well be a Khorne Herald on a Juggernaut. He won't be able to take an Ethersword, but he can take a locus, so I get value-added there. I'm constantly on the lookout for two-fers because you can get a lot more bang for your buck.
Ok, so Fateweaver has the reroll and the Herald has the book. If I go first, I can start the Crushers on the table. If not, I reserve them because I always only ever want to expose my Crushers to one turn of shooting before they charge. Fateweaver gives them a 90% chance at a 3++ and if his reroll isn't needed, he can use that dice for some other to hit or to wound roll.
To exploit that probability, I'm thinking about bringing a CSM Daemon Prince with the Black Mace along so I can both take a Heldrake and have the reroll as insurance against a 1 on the Daemon Weapon roll. I'm coming to the conclusion that you sort of need Monstrous Creatures as a form of Land Raider defense. The Daemon Prince can be used to spring the Crushers should they run afoul of Terminators or Dreadnoughts. Plus, he'll be a Tzeentch Prince so he gets rerolls on 1's to his saves anyway. We're way past two-fers at this point. I'm losing count. Fateweaver has AP1 shooting attacks for those targets than can threaten the Crusherstar as well, plus he can use Prescience on the Mace Prince so he rerolls all his many awesome attacks.
The nice thing about Fatey is that his reroll works once per player turn, so you get to use it again in your opponent's turn, not just your own. I'm saving my reroll for any unsaved S8 or better hits on my Crusherstar unless I need it for something more important, like keeping Fateweaver himself alive.
All of this only has to work for a turn or two before the Crushers should smash their way through enough of the opposing force that they can no longer put up much of a fight. On top of it all, Fateweaver is rerolling the warp storm results so things stay in my favor, and blasting away with one or two shots per turn. I've stacked the probabilities far enough in my favor that it has a better shot of working than not.
So, it would seem Fatecrusher has changed, but can still work pretty well if you put all the pieces in place. It's important to keep Fatey out of harm's way no matter the cost, but if he dies, you still have a 67% chance to use the Grimoire. I like to create synergies like the ones in this list. They complement each other well, without being totally crippled individually if one of the pieces of the puzzle vanishes.