An excerpt from Heathens and Heretics by Brother Pratus Corianus
On Death And Rebirth
As it is the light of Tavion that creates and sustains all life, it is certainly within His power to restore life to the dead. It is the natural order of things, however, to live and to die in their own time. It is not the general practice of the Church to make such miracles available to the general public. Indeed, even the Holy Emperor himself is subject to the natural order, and when he goes to the Bright Lord's side he shall not be drawn back into the world of the living. There are a few exceptions to this rule. Those among the faithful who die battling supernatural evils may, by dispensation of the Holy Emperor, be restored to life.
Many, if not most, heretical sects flaunt the laws set down by the Bright Lord on this point. Non-human pagans are often willing to revivify their people, as are the human practitioners of various cults. The fiendish Dhevrils have even been known to snare the souls of the dead and imprison them in the bodies of animals and other creatures. More heinous still, some heretical members of the Tavian clergy defy holy law and abuse the Bright Lord's power by performing unsanctioned resurrections. In addition to these unholy avenues, there are also claims that the soul can be restored to the body through the use of black magic.
Obviously, performing or making use of any of these practices is grounds for excommunication.
An excerpt from Heathens and Heretics by Brother Pratus Corianus
Excommunication
The highest sanction that can be placed on a heretic is excommunication from the Church. Excommunication has been described by some scholars as drawing a dark cloud in front of the sun; the one so sanctioned is cut off from the light of the Bright Lord. They can receive no blessing of any sort from the Tavian clergy. Even if they present themselves under false pretenses as one of the faithful, any miracles performed on their ehalf will have no effect.
Excommunication can only be performed by the Holy Emperor himself. It is a rare and terrible thing, reserved for the most irredeemable blasphemers and heretics. It is not applicable to those who are not baptised members of the Church; those who have not stood in the light cannot be blocked from it. It is paradoxical that even the wildest heathens are able to receive the blessings of the Church, but it is only through these demonstrations of Tavion's grace that such godless peoples might be converted.
It is the nature of men to be corrupted by temporal power, and for this reason the threat of excommunication is even stronger for those who wield it. The excommunication of a leader of men is applied to all those over who they have power. Those who renounce the wickedness of their ruler may be welcomed back into the Church through a simple ritual of atonement. It is through this method that the Church ensures just rulership of all the world where the light of Tavion shines.