I have found that it is absolutely vital to run a MTO style list. You need ~3 or so other major threats besides Be"lakor to engage the opponent. The
FMC list of course qualifies for this as it has 3-4 additional threats that can be where you need when you need. To be entirely upfront my current MTO lists were semi inspired (at least the actually design philosophy was) by Jy2's herald hammer lists. Be'Lakor has just expanded the list of units that I can use in this type of list as his guaranteed invisibility and added
MC engagement abilities help to enable such lists.
The units have found him to be great when combined with. Remember I run 2-3 of these unit with Be'Lakor.
-Mini Screamer star
-Blood crushers+Karanak (hounds are better, but I like the model and it does work alright in the S6-7 meta)
-Plague drone unit, fairly large w/ grimoire herald attached and/or epidemius
-landraider+scary
CC unit, usually kharne+
CSM or Typhus+plague marines, has the added benefit that Kharne+
CSM is brutal against the new knight models.
-juggerlord+spawn
-Nurgle Bikerlord+spawn/bikes
-beasts, fairly large w/ grimoire herald attached and/or epidemius
Ones that I don't use but would work as well or better than the above.
-seekers, large unit+herald
-Big unit of Hounds+herald
I have also been toying around with entering Be'Lakor on from reserves with some heldrakes and oblits and deploying zombie units to take the punishment. I haven't gotten the time to really mess with it though. I also am not convinced whether it will be reliable enough even with comms and whether I can both avoid interceptor on Be'Lakor and get him within range to contribute to the oblits.
The biggest thing is I usually bring something to block
LoS and make a point of getting
LoS blocking terrain on the board. This make Be'Lakor much more survivable as the only thing I really fear with him that fires without
LoS has a 30" range (
SMS, dang Tau). In this case 2-3 major threats bum rushing the Tau usually requires their attention to kill and if they fire on Be'Lakor they waste their
LoS weapons. The Landraider option interestingly enough works really well with him as it blocks
LoS to him itself.
I also have found that I sometimes have to start him further back than the rest of the army so his swoop doesn't take him too far forward. Nothing worse than a Be'Lakor alone within 12" of a bunch of small arms...ouch. The only reason Be'Lakor doesn't get blasted out of the sky and killed immediately in most my games is the fact the other units can multicharge the opponent and so are large immediate threats. When the opponents have focused down on Be'Lakor they usually waste too much firepower and are left without enough to handle the other units who get multicharges and can usually do more damage. Be'Lakor is definitely a scalpel.
He is not a tank at all and is one of the easier units to kill if you have ignore cover, have him in
LoS, and can ground him. Fateweaver always makes him much tougher as he can reroll his failed grounding checks. They are like super pals!
I also have never taken him in a primary CD
HQ slot. He either gets put in
CSM primary or allied or CD allied with
CSM primary. I am not a fan of uncontrolled warp storm rolls.