I seem to recall using reanimation (Death ritual) in Dom2 as Jotunheim would get me longdeads that were giants as opposed to regular man-sized undeads. That isnt happening in Dom3. Did they change something or I am confusing the spells?
It is a bug. Some other nations are also missing their national undead. In fact, some time ago there was a "C'tis Desert Tombs: no racial longdead anymore?" thread.