That's not the problem.
The problem is that Hordes have NO counters. Random hits don't hit enough.
Work Blast and Flamers like the Void Mine, pick a Unit, roll a D6 for each model in it up to a maximum.
The Number of Attacks this weapon may make is equal to the number of models in the targetted unit, that are within range of the Weapon. to a maximum of 6 for D3's, 12 for D6's and so on.
This world exists because of the things we have done, forever branching to the decisions we make and twisting to what we do not.
”Woe to our enemies. We'll tear them apart regardless.” ~Barrywise