I think it can work, but it need to inspire more from the Chaos Waste and not FoW.
Like take CoD’s Zombie mode and VT2’s FoW, in 1, you have a mode where you finish with the weapon you start with, in 1 you only have 1 map, and 1 you have no upgrades you can gain (though in CoD, those buff are time limited).
If we get a horde mode here I think we should see it as follow:
- In Mission weapon/boon/ammo/healing shops, which would use it’s own in mission currency (Call it Primers for example)
- Multiple maps (Taking place in different area of the game, maybe 1 per sector)
- Truly Endless and logarithmic increase of threat instead of finishing after a set number
Call it Wall of Martyr for fluff and it would work much more.
To this I would also add 2 out of 3 things:
- Have a ranked mode (Instead of having a 40k Weave mode)
- Have the ability to “build” and upgrade certain things in the missions (Turrets; AI soldier like the Skeleton from Sienna; Mines; Fortification…)
- Threshold rewards, simply insignia that follow a certain pattern of development