As per next update, we will feature a new experimental system, that is actually derived from a canon Ravenloft rule.
In short, it entails that there'll now be a slight risk that those you raise or resurrect become animated as undead instead. Normally, the risk is very small, but if the caster has been corrupted by the dark powers or if the spell is cast in areas corrupted by evil, the risk of animating gradually increases. Controversially, the risk become smaller if the spells are cast in holy grounds.
The motivation is largely to make death a less trivial thing - that we've noticed often requested - in a way that increases the suspense/unnerve without negatively influencing the gameplay experience.