FormerlyHemlock
Hero
In order for Tomb of Horrors to be really deadly, you have to fix the Sphere of Annihilation. In 5E it does some pathetic amount of damage (3d12?) instead of permanently annihilating you. I don't have my copy of Tales From the Yawning Portal, but if it's not filled to the brim with real Spheres of Annihilation I will be sorely disappointed in Acererak. (And I will take steps.)