There might be no consequences at all, or one might turn into a ghost, with a very small chance of becoming a True Wraith.
After numerous experiments, it seemed that there was a potential connection to whether the being killed had a Revenge BUFF before dying, which acted as a prerequisite condition.
Those without the Revenge BUFF wouldn't be controlled after death.
Those with the BUFF mostly turned into ghosts after their demise.
Only those with the BUFF and who suffered a Revenge Skull Shatter would be transformed into True Wraiths.
However, as soon as Gaven had mastered the secret of this skill, the capability of Undead Manipulation was merged into the realm of Undead Vengeance, turning probability into certainty.
As long as one was slain by Gaven within the realm of Undead Vengeance, they were bound to be transformed into a True Wraith.
This was the truly terrifying aspect of the realm of Undead Vengeance.