Note: For all map points of nameds in Fear Itself (for "thuledream.txt" map files), see this quest entry.
Argendev spawns in the basement of the temple inside the ring of fire. His ph's are the Ammy guards. He hits for a max ~12,500 and spawns timed adds called "a skeletal minion" (these hit for a max ~1,500; you may get one spawn per player on his hate list).
Respawn timer is 13.5 minutes for Argendev's PH.