Arcane Convolution

This spell distorts the rules of the universe for a radius of 120 feet, centered on you, wreaking arcane havoc. For the duration, some damage types are exchanged with others, as shown on the table below.
Additionally, no creature within range can regain hit points due to magic. Instead, when a creature would regain hit points, it must make a Constitution saving throw or take necrotic damage equal to the amount it would have regained (rounded down.)

Fire => Lightning

Lightning => Radiant

Radiant => Psychic

Psychic =>  Force

Force => Thunder

Thunder => Cold

Cold => Necrotic

Necrotic => Poison

Poison => Acid

Acid => Fire