Imban said:Well, that description and powerset alone does indeed give worldbuilders the choice to cast Mind Flayer thralls like that. They could assume, like you did, that Mind Flayers' slaves aren't actually fully mind-wiped, but just enslaved by terror and the superior power of Mind Flayers. That's actually rather cool. The "problem" for those of us who like monster stats to represent what monsters are capable of is when the choice is made explicit that Mind Flayer thralls are actually Dominated in some way - perhaps they have no minds left at all anymore and fall dead when their master is slain - but yet no information is provided on how this status comes about.
A little phrasing explaining that, for instance, Mind Flayers create their Dominated thralls by sucking out their target's brains and replacing them with magical goo, or through a five-minute version of their Charming process that can only be performed on a helpless foe, or whatever, goes a long way. It's good to let DMs make up how and whether monsters fit into their setting. It's bad to force DMs to make up stuff in order to explain how a monster makes sense or does its presented schtick at all.
It's much like the gray or green slaad entry which states they make and aquire magical items to increase their own spell casting, but have no feats, no magic items, and few items that would help them increase their power since they have little way of using wands or staves, being that they have no spell list, on spell-like abilities.
The angle I come from is, I'd rather be told that I am being given the combat stats and a fluffy statement to flesh out myself then given an entry that should contain all there is to know about a creature and not have it make sense with what was told in the fluffy.
I do understand the want to have the information. I don't need to be told how a devil is creating and controlling an undead army (the control undead rules never supported such a thing in the first place, really) if such a broad, blanket statement were made in the fluffy paragraph. I would simply make up a way and a reason for it to do so.
But I can understand the want to have a a stat block saying they have an animate dead ritual that involved the devil in question flaying the skin off the victum and weaving a piece of that flesh into a belt, and that should the belt be destroyed (by burning, perhaps), all the undead who's skin was woven into that belt would fall to dust. Loosing the belt causes the devil to loose control of the undead it created, but no one else can control the undead with the belt except the demon.
One statement, the devil creates army of the undead, is a bit lacking (in the very least, it should cross reference the type of undead it creates [i.e., See cankerous zombies on page 248 of the MM] and how many it should have with it in order to help DMs build a level-appropriate challege). The other at least gives DMs something to work with plotwise: it's a ritual, it takes some time and the devil's direct involvement, and the undead army can be defeated at its source: destroy the belt, destroy the army.