I've spent ten minutes trying to come up with a way of phrasing this succinctly and adequately and as of yet have failed.
This is a- as far as I can tell, largely serious- merging of a black-humor post-apocalypse setting, and the spinoff of a spinoff of a commercial for toy ponies for little girls.
Look, I'm not going to disparage anyone's use of free time here- if you like dayglow juvenile horses, go right ahead; after all, this is all a microcosm of what the uninitiated might describe as a computer program that mainly generates detailed descriptions of horrific combat wounds inflicted by unarmed midget alcoholics upon Jewish stereotypes.
Nonetheless, this is the only creative project where a statement like "Automated turrets will work like immobile pets you can chain or pasture at chokepoints, which will attack any enemies in range. They'll be especially useful for steel rangers and Unity alicorns," is substantially more bizarre in its context, which is that your pet sentries will be murdering enemy horses for you.
On reflection this is, of course, inevitable, since two of the most popular total conversions for DF have to be the fallout mod and the pony mod. The fact that I understand this somehow fails to make the existence of this mod (and, indeed, the larger external background which apparently exists) more comprehensible.
Shine, shine on, you strange and wonderful lunatics. I applaud you.