So uh... not going to lie, Genestealer Bikes are looking REALLY scary right now? As all things GSC it requires some rule stacking up consider the following ability all the bikes get by default:
Demolition Run: Each time this unit ends a Normal move, you can select one enemy unit within 6" of and visible to this unit and roll one D6 for each model in this unit: for each 4+, that enemy unit suffers 1 mortal wound.
It's essentially the same as using the "Grenade" Stratagem - except on steroids, because Grenade is flat 6 dice, here it can go up to 10 per unit. Note that it says "normal move", so lets read the ability on a Jackal Alpus:
Master Outrider: In your Shooting phase, after this model’s unit has shot, if it is not within Engagement Range of any enemy units, that unit can make a Normal move of up to 6" as if it were your Movement phase. If it does, until the end of the turn, that unit is not eligible to declare a charge.
It will be hard points-wise to get multiple of these stuffed into the list, so let's assume that one unit just does DOUBLE demolition runs every turn. But wait, there's more. You can upgrade one Alphus with the following enhancement if you have points to spare:
Prowling Agitant: Genestealer Cults model only. Once per turn, when an enemy unit ends a Normal, Advance or Fall Back move within 9" of the bearer’s unit, if the bearer’s unit is not within Engagement Range of any enemy units, it can make a Normal move of up to D6"
Just to add to the madness you can also do that in your opponent's turn. So let's assume you roll up with 2 units, one with a leader. That's a potential 30 dice to roll for Demo-Run PLUS 6 if you wanted to throw another grenade onto the pile. A statistical average of 50% will turn into mortal wounds. That's 18 mortals on average AND NONE OF THESE UNITS HAVE EVEN STARTED SHOOTING YET.
This looks utterly INSANE - sure, you essentially have to Leeroy Jenkins your Bikes into the enemy army, but here's a little detail: the Bikes have CULT AMBUSH. So when they die, there's a 50% chance they just respawn somewhere on the edges of the board. I wouldn't exactly bank on that but imagine the look on your opponent's face when he finally got rid of this grenade-juggling murderpile, only for it to COME BACK AND DO IT ALL OVER AGAIN.
