The Death Curse

This mysterious curse has afflicted all creatures, spreading
fear and panic amongst the populace. For informational purposes, the players can be made aware of the following: 
•  Any creature whose hit point maximum has been reduced to 0 (via life draining or similar effect) will die immediately. 
•  Permanently reduced hit point maximums cannot be restored. 
•  The dead cannot be brought back to life by any known means (resurrection, raise dead,
etc.). 
•  Those that have been previously resurrected begin to physically wither and eventually waste away.