49 necro pet research mats

[Hakubi]

Spent 48+ hours in the tunnel looking for this without a single bite and feel my only hope at this point is going to be getting the words for it by vendor diving. I managed to get Words of Acquisition (Beza) and now only need Words of Requisition, the problem is the wiki doesn't list what specifically drops them other than mobs around ~49 which basically means checking vendors around Seb/Velks/KC, right? Anything other than Cabilis, FV, Thurg, and OT merchants worth checking? The ones I checked were full of only junk and I don't really know what area players frequent selling from 49+ dungeons because this is my main and I've never done it myself.