Relic weapons? no, those are only dropped in the cities (as of now) They can drop AF, but like everything else here thats rare. More notable for this mob is it likes to DOOM someone, or astral flow and have its pet kill most of your group.
You know, that wonderfull countdown timer till you just flat out die.
As for crystal, necklace, feather drop... That DOES NOT drop for this mob.
Yea, nothing in dynamis anywhere drops "some extra powerful lvl 75 weapon." Though they can drop relic weapons that can be upgraded to the best weapons in the game =P. This guy can probably drop one of those and some random pieces of different AF2 sets, like most other things in Dyna.