SITUATION
I had a party fleeing from a dungeon. They found the artifact they were looking for, which they had battled a wight and a bunch of zombies for. They killed the wight pretty easily, a zombie, and turned the remaining four zombies. To avoid the turned zombies after the spell effect dissipated, they took a short cut through the tomb's central great hall. A void spider was waiting in the dark and attacked the party for disturbing its lair. The party has a quick and bloody battle they were hoping to avoid, and the wizard is bit by the void spider and fails the poison CON DC twice, once using a luck token. The wizard goes to 0 HP just as the void spider is slayed. A priest heals him for