Note: For all map points of nameds in Fear Itself (for "thuledream.txt" map files), see this quest entry.
Rerekalen has multiple PHs in one of the upper floors of the temple inside the ring of fire. He hits for a max ~12,500.
This mob spawns at +745, +370, +150 This would be the first room you come to after taking a right hand turn at the first fork when entering this level. (note: that right hand turn is into and through a fake wall, so you'll only see it if your map shows it).