Conjure Infernal Energies

A wave of hellish energy washes out from a point of your choice within range. Those energies are "rules" of Hells that establish fast regeneration there, thus allowing endless torture. However, the same energies bring some suffering and pain from Hells to creatures targeted by the spell.  

Choose up to six creatures in a 30-foot-radius sphere centered on that point. Each target regains hit points equal to 3d8 + your spellcasting ability modifier and at the same time takes 1d8 psychic damage. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the healing increases by 1d8 for each slot level above 4th.