[Tananthalas]

Lich bear in mind aggro in Everquest was also based on proximity. A caster that stands at max distance from a mob is less likely to be attacked than a caster at melee range with a mob. I honestly don't recall why this was true but any raids always required max melee distance while the tank was dam'n near inside of the mob. You can easily see this in action when you root a mob, whoever is closest to the mob while it is rooted has aggro, regardless of how much it wants to kill someone else.