Note: For all map points of nameds in Erudin Burning (for "fallen.txt" map files), see this quest entry.
Femurstack's PHs are "a bone golem tormentor", "a bone golem terrorizer", "a bone golem horror" and Femurstack all spawn in the same locations. These mobs around the library (one also spawns just outside the tunnel leading to the Quest NPC area).
Femurstack hits for a max ~9,300.
Has approx. 850,000 HP. Casts Bonedust spray every approx. 18 seconds.