Fieldcraft Demimateria III ?!?

[Silvus]

All the Demimateria types primarily come from desynth and it is the main reason desynth is of use. I myself have never seen nor heard of another methord of gaining but can not say 100% that is the case.
Talan in Mor Dhona is not viable for Fieldcraft Demimateria III by the way. Yes you can trade with him for them but the items he trades for them all require 2 Fieldcraft Demimateria IIIs to make and he only gives 1 back (this was only there to reclaim some of the losses for the items being nq instead of hq back when items were traded for the tools)

Edit: Just to make a note, if your FC plans on keeping up to date with crafting and gatherering equipment as it comes out by making it yourself it is totally worth someone leveling their desynth to get FC3s (leatherworker has worked wonders for me in this) as they have been needed in just about every end game crafting since intruduction. at 50 was used to make the item traded for the tools, at 60 was used to make many pieces of the gear and 70 is the same again and so we can expect it to keep happening.