Hermes Vestige Part A
Location: Depths – Den of the Dead
From the mistle, take the path heading south (while facing the locked metal door) and follow it until you reach the split. At the split, head right and keep following the path until you come to a giant red box with a lantern on the top. Swing a right around the box and hug the right wall. The vestige will be down some rock steps at the end of the path. This is also a Trail of Blood area, so be ready to fight off waves of enemies.
Hermes Vestige Part B
Location: Depths – Town of Sacrifice
From the mistle, take the eastern path and head straight across to where the dog is eating a corpse. Take care of the dog then take a right to find the vestige. Be ready to fight as this is also the location of a Trial of Blood.
Hermes Vestige Part C
Location: Depths – Swirling Flood
From the mistle, take the western path to head through a tunnel. When you exit the tunnel, take a left and keep moving forward to the end of the path. The vestige will be located there.
Hermes Vestige Part D
Location: Depths – Cliffs of Rest
From the mistle, follow the path south coming to a big open room. Head down the stairs toward the center of the room then take a left to locate another set of stairs a short distance away on the left. Head up those stairs and follow the path to the back to locate this vestige. There will be a few enemies guarding it.