RH came out so long ago and now its getting some popularity. Some of the best Unending Hosts and The Purge formations have already been made. My list is not one of them...
Lols, I am going to try to ghetto hammer the hell out of what I have on hand to meet the minimum requirements of models. The Great Cloak Troopers where a great deal but unfortunately, the company went out of business...

The freaking sellers on ebay are selling it piece meal and it would cost about $3.75 per model which is not what I wanted to do to save money.
first detachment: The Unending Host
Renegade Command Squad, Master of the Horde,-65
Troops
Mandatory Infantry Platoon 1
Platoon Command squad,Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with Plasma guns, 2
HWT Lascannons (4 Men)-165
squad 1,Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with Plasma guns, 2
HWT Lascannons (4 Men)-165
squad 2,Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with Plasma guns, 2
HWT Lascannons (4 Men)-165
sub total 495
Mandatory Infantry Platoon 2 (Each squad has 20 men due to
hwt counts as 2 men)
Platoon Command squad, Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with melta guns, 2
HWT Lascannons (4 Men)-150
squad 1,Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with melta guns, 2
HWT Lascannons (4 Men)-150
squad 2,Militia training, sub flak armor, 12 Men with lasguns, 1 Man with a sigil, 3 Men with melta guns, 2
HWT Lascannons (4 Men)-150
sub total 450
Mandatory 3rd Troops: 10 Mutant rabbles-30
Mandatory 4th Troops: 10 Mutant Rabbles-30
Second Detachment: The Purge Formation
Renegade Command Squad-45
6x3 Spawns-330
Total=1445
Is 18 spawns enough of a distraction to allow the melta gun squads to march up and zap enemy vehicles? The spawns can glance the rear armor of non walkers av10 decently with their str5. I was thinking about trying to add 9 more.
Is 12 las cannons too much? Should I use 6 Autocannons and 6 Lascannons? I have a crazy idea to convert my autocannons into missile launchers...
I have zero anti air. How should I address that with this army? What is the best way compared to the sub optimal cheap $ way? Cheap aegis line with quad gun?
edit: delted spawns in Unending host and covenant of tzeentch