From Street Magic, page 177:
"Iron Will
Cost: .25 per level.
Iron Will makes an adept's mind resistant to external influences. The character may add the power's level in bonus dice to tests to resist magical mind control or alteration -- including Mental Manipulation spells and some critter and adept powers."
From Street Magic, page 101, under Possession:
"...The spirit makes an Opposed Test pitting its Force X 2 against the vessel's Intution + Willpower Test..."
I think Iron Will helps the resistance to Possession. How do others see this?
Peter