You can summon Proserpina`s mother Ceres through prayer here. Your praying will then decide how much Ceres will support you against Dīs Pater on the next day in the Underworld. For the injustice of what was done to her daughter, the goddess of fertility provides all with a regeneration buff - in full knowledge that healing is only possible in this manner. Dīs Pater should never be allowed to keep someone in the Underworld through the consumption of food ever again.
It helps you heal in the underworld, maybe, good luck.