Bioreciprocity

A bolt of sickly green lightning erupts from your body, striking a target in range that you can see. The target can be a creature, an object, or a creation of magical force, such as the wall created by wall of force.

A creature targeted by this spell takes 8d8+40 necrotic damage. The spellcaster takes the exact same amount of damage. This spell cannot be dodged, redirected, or blocked. If the caster is normally resistant or immune to necrotic damage, they will still take full damage from casting this spell.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.