from what I read the disguise mechanics the FWs wrote here actually require player-to-player interaction in order to craft, which is already a step up from many other CAs on the server, some of which don't even have a disguise limit or requirements and can simply just "do it" with 0 cost. in this lore it seems like you need to actually interact with players in order to reap the benefits of a disguise, making it a high risk = high reward ability. it's one of the few ways to incentivize darkspawn interactions with the average player without invoking shitty kill-quota mechanics. the best part is you don't even need to kill a guy, you just gotta take some blood or cut off a finger
on top of that, it says you need keep these body parts in your inventory in order for the disguise to remain active. if you're /invsearched in a nation's gatehouse (not uncommon) while trying to get inside and are caught carrying bones, teeth, skin, nails, and blood, you'd have to think of something pretty damn clever on the spot to talk your way out of that if you're lucky, otherwise you're kinda screwed. on top of that they can't harvest these things from other FWs. it's not perfect and could use some tweaking but it's pretty creative and balanced for the most part imo