"The blood shall be a sign for you on the houses where you live; and when I see the blood I will pass over you, and no plague will befall you to destroy you when I strike the land..."
The Lair is to be found at (35k, 35k) Caledor.
He drops blue chest peices.
From the High Elf Warcamp Conqueror's Descent head down the path to the RVR zone and at (31k, 35k), stop. You can see the cave from the path. Hop the rocks and you are there.
From the Shrine of the Conqueror head up the path towards the High Elf Warcamp and at (31k, 35k), stop. You can see the cave from the path. Hop the rocks and you are there.
Festitt hides out in the small cave within the cave.