As of the current state of game, the hardcore mode post-death ghost thing is garbage. It should generate a little light to only the ghost so they can see what they missed in their worlds when they died. They should also be able to teleport to players in the game so they can spectate them. Another thing is they should be able to open chests but not take anything out. This could help people realize what they could've done in their world and see what they should've done. The ghost can literally do nothing. Maybe there could be a post Lunatic Cultist item that sometimes drop froms him which allows players to revive the dead hardcores. This could give more of a multiplayer friendly aspect to the hardcore mode.