World of Zhehon
The Death Wars was a very dark time for Zhehon. After Ineos was destroyed, Cerion rose to power against the Zhehon Emperor and conquered most of the lands. This would have been the end of Zhehon if the rebellion had not managed to unify most of the races against him. The unification did not last much after his defeat as each side blamed the other for Cerion's power.
Even after the races became divided, this was not the worst of the final effects of the Death Wars. The power Cerion had over Necromancy was the final force holding the death of Ineos in check. Once Cerion was destroyed nothing held the dead from coming back to life. With Cerion gone, all who died and not properly buried would rise again after a few nights had past.