Since the recent update, a friend and I have been going into Dynamis - Valkurm just about every day in an attempt to obtain some relic accessories - note that we are only killing Nightmare Sheep (and a couple TEs when they're up).

A few notes:

Warrior's Stone has dropped 5 times
Bard's Cape has dropped 5 times
Summoner's Cape has dropped once

All 3 of these items are confirmed drops from Nightmare Hippogryph and Nightmare Sabotender, but not from Nightmare Sheep.

Have the drops changed for this zone?